19959365616 has 40 divisors (see below), whose sum is σ = 51567105744. Its totient is φ = 6652423680.

The previous prime is 19959365611. The next prime is 19959365617. The reversal of 19959365616 is 61656395991.

It is a self number, because there is not a number n which added to its sum of digits gives 19959365616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19959365611) 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, 659946 + ... + 689526.

Almost surely, 2^19959365616 is an apocalyptic number.

19959365616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19959365616 is an abundant number, since it is smaller than the sum of its proper divisors (31607740128).

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

19959365616 is a wasteful number, since it uses less digits than its factorization.

19959365616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43649 (or 43643 counting only the distinct ones).

The product of its digits is 11809800, while the sum is 60.

The spelling of 19959365616 in words is "nineteen billion, nine hundred fifty-nine million, three hundred sixty-five thousand, six hundred sixteen".