15936790081 has 3 divisors (see below), whose sum is σ = 15936916323. Its totient is φ = 15936663840.

The previous prime is 15936790061. The next prime is 15936790099. The reversal of 15936790081 is 18009763951.

The square root of 15936790081 is 126241.

It is a perfect power (a square), and thus also a powerful number.

15936790081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 866772481 + 15070017600 = 29441^2 + 122760^2 .

It is not a de Polignac number, because 15936790081 - 2⁵ = 15936790049 is a prime.

It is a super-2 number, since 2×15936790081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15936790061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 63121 + ... + 189361.

It is an arithmetic number, because the mean of its divisors is an integer number (5312305441).

Almost surely, 2^15936790081 is an apocalyptic number.

15936790081 is the 126241-st square number.

15936790081 is the 63121-st centered octagonal number.

It is an amenable number.

15936790081 is a deficient number, since it is larger than the sum of its proper divisors (126242).

15936790081 is an frugal number, since it uses more digits than its factorization.

15936790081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252482 (or 126241 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 49.

Multiplying 15936790081 by its sum of digits (49), we get a square (780902713969 = 883687²).

The spelling of 15936790081 in words is "fifteen billion, nine hundred thirty-six million, seven hundred ninety thousand, eighty-one".