19977752256 has 112 divisors (see below), whose sum is σ = 65900686080. Its totient is φ = 5189022720.

The previous prime is 19977752237. The next prime is 19977752359. The reversal of 19977752256 is 65225777991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×19977752256² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19977752256.

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, 660871 + ... + 690438.

Almost surely, 2^19977752256 is an apocalyptic number.

19977752256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19977752256 is an abundant number, since it is smaller than the sum of its proper divisors (45922933824).

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

19977752256 is a wasteful number, since it uses less digits than its factorization.

19977752256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351342 (or 1351332 counting only the distinct ones).

The product of its digits is 16669800, while the sum is 60.

The spelling of 19977752256 in words is "nineteen billion, nine hundred seventy-seven million, seven hundred fifty-two thousand, two hundred fifty-six".