15561136746 has 32 divisors (see below), whose sum is σ = 34667455680. Its totient is φ = 5173972848.

The previous prime is 15561136739. The next prime is 15561136751. The reversal of 15561136746 is 64763116551.

15561136746 is a `hidden beast` number, since 1 + 5 + 561 + 13 + 6 + 74 + 6 = 666.

15561136746 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×15561136746² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 341496 + ... + 384371.

It is an arithmetic number, because the mean of its divisors is an integer number (1083357990).

Almost surely, 2^15561136746 is an apocalyptic number.

15561136746 is an abundant number, since it is smaller than the sum of its proper divisors (19106318934).

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

15561136746 is a wasteful number, since it uses less digits than its factorization.

15561136746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726275 (or 726269 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The spelling of 15561136746 in words is "fifteen billion, five hundred sixty-one million, one hundred thirty-six thousand, seven hundred forty-six".