19971519712 has 24 divisors (see below), whose sum is σ = 41028449616. Its totient is φ = 9551596032.

The previous prime is 19971519707. The next prime is 19971519727. The reversal of 19971519712 is 21791517991.

It is a self number, because there is not a number n which added to its sum of digits gives 19971519712.

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, 13566873 + ... + 13568344.

It is an arithmetic number, because the mean of its divisors is an integer number (1709518734).

Almost surely, 2^19971519712 is an apocalyptic number.

It is an amenable number.

19971519712 is an abundant number, since it is smaller than the sum of its proper divisors (21056929904).

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

19971519712 is a wasteful number, since it uses less digits than its factorization.

19971519712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27135250 (or 27135242 counting only the distinct ones).

The product of its digits is 357210, while the sum is 52.

The spelling of 19971519712 in words is "nineteen billion, nine hundred seventy-one million, five hundred nineteen thousand, seven hundred twelve".