15565290138 has 24 divisors (see below), whose sum is σ = 33729078708. Its totient is φ = 5187771072.

The previous prime is 15565290137. The next prime is 15565290149. The reversal of 15565290138 is 83109256551.

15565290138 is a `hidden beast` number, since 1 + 556 + 5 + 2 + 90 + 1 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11025630009 + 4539660129 = 105003^2 + 67377^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15565290093 and 15565290102.

It is not an unprimeable number, because it can be changed into a prime (15565290137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103020 + ... + 204312.

Almost surely, 2^15565290138 is an apocalyptic number.

15565290138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

15565290138 is an abundant number, since it is smaller than the sum of its proper divisors (18163788570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15565290138 is a wasteful number, since it uses less digits than its factorization.

15565290138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109838 (or 109835 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 15565290138 in words is "fifteen billion, five hundred sixty-five million, two hundred ninety thousand, one hundred thirty-eight".