19718704917 has 24 divisors (see below), whose sum is σ = 28563350400. Its totient is φ = 13108580928.

The previous prime is 19718704913. The next prime is 19718704937. The reversal of 19718704917 is 71940781791.

It is a happy number.

19718704917 is a `hidden beast` number, since 1 + 9 + 71 + 87 + 0 + 491 + 7 = 666.

It is not a de Polignac number, because 19718704917 - 2² = 19718704913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19718704913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6143209 + ... + 6146417.

It is an arithmetic number, because the mean of its divisors is an integer number (1190139600).

Almost surely, 2^19718704917 is an apocalyptic number.

It is an amenable number.

19718704917 is a deficient number, since it is larger than the sum of its proper divisors (8844645483).

19718704917 is a wasteful number, since it uses less digits than its factorization.

19718704917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4937 (or 4934 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 54.

The spelling of 19718704917 in words is "nineteen billion, seven hundred eighteen million, seven hundred four thousand, nine hundred seventeen".