15966502656 has 144 divisors (see below), whose sum is σ = 45875454240. Its totient is φ = 4900700160.

The previous prime is 15966502639. The next prime is 15966502729. The reversal of 15966502656 is 65620566951.

It is a junction number, because it is equal to n+sod(n) for n = 15966502599 and 15966502608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4600890 + ... + 4604358.

Almost surely, 2^15966502656 is an apocalyptic number.

15966502656 is a gapful number since it is divisible by the number (16) 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 15966502656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22937727120).

15966502656 is an abundant number, since it is smaller than the sum of its proper divisors (29908951584).

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

15966502656 is a wasteful number, since it uses less digits than its factorization.

15966502656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3962 (or 3948 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 51.

The spelling of 15966502656 in words is "fifteen billion, nine hundred sixty-six million, five hundred two thousand, six hundred fifty-six".