19508601972 has 12 divisors (see below), whose sum is σ = 45520071296. Its totient is φ = 6502867320.

The previous prime is 19508601961. The next prime is 19508602021. The reversal of 19508601972 is 27910680591.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812858404 + ... + 812858427.

Almost surely, 2^19508601972 is an apocalyptic number.

19508601972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19508601972 is an abundant number, since it is smaller than the sum of its proper divisors (26011469324).

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

19508601972 is a wasteful number, since it uses less digits than its factorization.

19508601972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625716838 (or 1625716836 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 48.

The spelling of 19508601972 in words is "nineteen billion, five hundred eight million, six hundred one thousand, nine hundred seventy-two".