15880050397 has 4 divisors (see below), whose sum is σ = 15880671580. Its totient is φ = 15879429216.

The previous prime is 15880050377. The next prime is 15880050443. The reversal of 15880050397 is 79305008851.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11616743961 + 4263306436 = 107781^2 + 65294^2 .

It is a cyclic number.

It is not a de Polignac number, because 15880050397 - 2¹⁹ = 15879526109 is a prime.

It is a super-2 number, since 2×15880050397² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15880050377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270522 + ... + 323947.

It is an arithmetic number, because the mean of its divisors is an integer number (3970167895).

Almost surely, 2^15880050397 is an apocalyptic number.

It is an amenable number.

15880050397 is a deficient number, since it is larger than the sum of its proper divisors (621183).

15880050397 is an equidigital number, since it uses as much as digits as its factorization.

15880050397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621182.

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 15880050397 in words is "fifteen billion, eight hundred eighty million, fifty thousand, three hundred ninety-seven".