15918051081 has 4 divisors (see below), whose sum is σ = 21224068112. Its totient is φ = 10612034052.

The previous prime is 15918051049. The next prime is 15918051091. The reversal of 15918051081 is 18015081951.

It is a happy number.

15918051081 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 Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 15918051081 - 2⁵ = 15918051049 is a prime.

It is a super-2 number, since 2×15918051081² (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 (15918051011) 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 3 ways as a sum of consecutive naturals, for example, 2653008511 + ... + 2653008516.

It is an arithmetic number, because the mean of its divisors is an integer number (5306017028).

Almost surely, 2^15918051081 is an apocalyptic number.

It is an amenable number.

15918051081 is a deficient number, since it is larger than the sum of its proper divisors (5306017031).

15918051081 is an equidigital number, since it uses as much as digits as its factorization.

15918051081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306017030.

The product of its (nonzero) digits is 14400, while the sum is 39.

The spelling of 15918051081 in words is "fifteen billion, nine hundred eighteen million, fifty-one thousand, eighty-one".