19912473256 has 32 divisors (see below), whose sum is σ = 40524503040. Its totient is φ = 9118001088.

The previous prime is 19912473253. The next prime is 19912473277. The reversal of 19912473256 is 65237421991.

It is not an unprimeable number, because it can be changed into a prime (19912473253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 740596 + ... + 767011.

It is an arithmetic number, because the mean of its divisors is an integer number (1266390720).

Almost surely, 2^19912473256 is an apocalyptic number.

It is an amenable number.

19912473256 is an abundant number, since it is smaller than the sum of its proper divisors (20612029784).

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

19912473256 is a wasteful number, since it uses less digits than its factorization.

19912473256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507753 (or 1507749 counting only the distinct ones).

The product of its digits is 816480, while the sum is 49.

The spelling of 19912473256 in words is "nineteen billion, nine hundred twelve million, four hundred seventy-three thousand, two hundred fifty-six".