15947318464 has 56 divisors (see below), whose sum is σ = 39454092288. Its totient is φ = 6213239040.

The previous prime is 15947318419. The next prime is 15947318473. The reversal of 15947318464 is 46481374951.

It is a tau number, because it is divible by the number of its divisors (56).

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, 1613104 + ... + 1622959.

Almost surely, 2^15947318464 is an apocalyptic number.

15947318464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

15947318464 is an abundant number, since it is smaller than the sum of its proper divisors (23506773824).

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

15947318464 is a wasteful number, since it uses less digits than its factorization.

15947318464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3236093 (or 3236083 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 52.

The spelling of 15947318464 in words is "fifteen billion, nine hundred forty-seven million, three hundred eighteen thousand, four hundred sixty-four".