15855787816 has 32 divisors (see below), whose sum is σ = 33550653600. Its totient is φ = 6958651840.

The previous prime is 15855787807. The next prime is 15855787847. The reversal of 15855787816 is 61878755851.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3103990 + ... + 3109093.

It is an arithmetic number, because the mean of its divisors is an integer number (1048457925).

Almost surely, 2^15855787816 is an apocalyptic number.

It is an amenable number.

15855787816 is an abundant number, since it is smaller than the sum of its proper divisors (17694865784).

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

15855787816 is a wasteful number, since it uses less digits than its factorization.

15855787816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6213129 (or 6213125 counting only the distinct ones).

The product of its digits is 18816000, while the sum is 61.

The spelling of 15855787816 in words is "fifteen billion, eight hundred fifty-five million, seven hundred eighty-seven thousand, eight hundred sixteen".