19951565212056 has 32 divisors (see below), whose sum is σ = 49879024406640. Its totient is φ = 6650506887168.

The previous prime is 19951565212027. The next prime is 19951565212069. The reversal of 19951565212056 is 65021256515991.

It is a junction number, because it is equal to n+sod(n) for n = 19951565211987 and 19951565212005.

It is a congruent number.

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, 17559000 + ... + 18660696.

Almost surely, 2^{19951565212056} is an apocalyptic number.

It is an amenable number.

19951565212056 is an abundant number, since it is smaller than the sum of its proper divisors (29927459194584).

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

19951565212056 is a wasteful number, since it uses less digits than its factorization.

19951565212056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856283 (or 1856279 counting only the distinct ones).

The product of its (nonzero) digits is 7290000, while the sum is 57.

The spelling of 19951565212056 in words is "nineteen trillion, nine hundred fifty-one billion, five hundred sixty-five million, two hundred twelve thousand, fifty-six".