15856564464 has 120 divisors (see below), whose sum is σ = 48807001152. Its totient is φ = 4775109120.

The previous prime is 15856564463. The next prime is 15856564579. The reversal of 15856564464 is 46446565851.

15856564464 is a `hidden beast` number, since 1 + 585 + 6 + 56 + 4 + 4 + 6 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 15856564464.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15856564463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2127 + ... + 178094.

Almost surely, 2^15856564464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15856564464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24403500576).

15856564464 is an abundant number, since it is smaller than the sum of its proper divisors (32950436688).

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

15856564464 is a wasteful number, since it uses less digits than its factorization.

15856564464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180295 (or 180286 counting only the distinct ones).

The product of its digits is 13824000, while the sum is 54.

The spelling of 15856564464 in words is "fifteen billion, eight hundred fifty-six million, five hundred sixty-four thousand, four hundred sixty-four".