19923715739 has 2 divisors, whose sum is σ = 19923715740. Its totient is φ = 19923715738.

The previous prime is 19923715733. The next prime is 19923715759. The reversal of 19923715739 is 93751732991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19923715739 - 2²⁴ = 19906938523 is a prime.

It is a super-2 number, since 2×19923715739² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19923715733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9961857869 + 9961857870.

It is an arithmetic number, because the mean of its divisors is an integer number (9961857870).

Almost surely, 2^19923715739 is an apocalyptic number.

19923715739 is a deficient number, since it is larger than the sum of its proper divisors (1).

19923715739 is an equidigital number, since it uses as much as digits as its factorization.

19923715739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3214890, while the sum is 56.

The spelling of 19923715739 in words is "nineteen billion, nine hundred twenty-three million, seven hundred fifteen thousand, seven hundred thirty-nine".