19717862413 has 2 divisors, whose sum is σ = 19717862414. Its totient is φ = 19717862412.

The previous prime is 19717862399. The next prime is 19717862419. The reversal of 19717862413 is 31426871791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18529198884 + 1188663529 = 136122^2 + 34477^2 .

It is a cyclic number.

It is not a de Polignac number, because 19717862413 - 2²¹ = 19715765261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19717862419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9858931206 + 9858931207.

It is an arithmetic number, because the mean of its divisors is an integer number (9858931207).

Almost surely, 2^19717862413 is an apocalyptic number.

It is an amenable number.

19717862413 is a deficient number, since it is larger than the sum of its proper divisors (1).

19717862413 is an equidigital number, since it uses as much as digits as its factorization.

19717862413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The spelling of 19717862413 in words is "nineteen billion, seven hundred seventeen million, eight hundred sixty-two thousand, four hundred thirteen".