15856961731590 has 160 divisors (see below), whose sum is σ = 44424701017056. Its totient is φ = 3622174832640.

The previous prime is 15856961731543. The next prime is 15856961731661. The reversal of 15856961731590 is 9513716965851.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 116116150 + ... + 116252630.

Almost surely, 2^{15856961731590} is an apocalyptic number.

15856961731590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 15856961731590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22212350508528).

15856961731590 is an abundant number, since it is smaller than the sum of its proper divisors (28567739285466).

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

15856961731590 is a wasteful number, since it uses less digits than its factorization.

15856961731590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138132 (or 138111 counting only the distinct ones).

The product of its (nonzero) digits is 61236000, while the sum is 66.

The spelling of 15856961731590 in words is "fifteen trillion, eight hundred fifty-six billion, nine hundred sixty-one million, seven hundred thirty-one thousand, five hundred ninety".