15996619968 has 448 divisors, whose sum is σ = 52669440000. Its totient is φ = 4273640448.

The previous prime is 15996619921. The next prime is 15996619981. The reversal of 15996619968 is 86991669951.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (69).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 89366503 + ... + 89366681.

Almost surely, 2^15996619968 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 15996619968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26334720000).

15996619968 is an abundant number, since it is smaller than the sum of its proper divisors (36672820032).

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

15996619968 is a wasteful number, since it uses less digits than its factorization.

15996619968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 273 counting only the distinct ones).

The product of its digits is 56687040, while the sum is 69.

The spelling of 15996619968 in words is "fifteen billion, nine hundred ninety-six million, six hundred nineteen thousand, nine hundred sixty-eight".