15664495920 has 160 divisors (see below), whose sum is σ = 52306366464. Its totient is φ = 3866649600.

The previous prime is 15664495901. The next prime is 15664495933. The reversal of 15664495920 is 2959446651.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125350 + ... + 216890.

Almost surely, 2^15664495920 is an apocalyptic number.

15664495920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15664495920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26153183232).

15664495920 is an abundant number, since it is smaller than the sum of its proper divisors (36641870544).

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

15664495920 is a wasteful number, since it uses less digits than its factorization.

15664495920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91611 (or 91605 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 51.

The spelling of 15664495920 in words is "fifteen billion, six hundred sixty-four million, four hundred ninety-five thousand, nine hundred twenty".