19972919616 has 56 divisors (see below), whose sum is σ = 56910024864. Its totient is φ = 6145512960.

The previous prime is 19972919611. The next prime is 19972919627. The reversal of 19972919616 is 61691927991.

It is a self number, because there is not a number n which added to its sum of digits gives 19972919616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19972919611) 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, 3998490 + ... + 4003481.

It is an arithmetic number, because the mean of its divisors is an integer number (1016250444).

Almost surely, 2^19972919616 is an apocalyptic number.

19972919616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19972919616 is an abundant number, since it is smaller than the sum of its proper divisors (36937105248).

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

19972919616 is a wasteful number, since it uses less digits than its factorization.

19972919616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8001999 (or 8001989 counting only the distinct ones).

The product of its digits is 3306744, while the sum is 60.

The spelling of 19972919616 in words is "nineteen billion, nine hundred seventy-two million, nine hundred nineteen thousand, six hundred sixteen".