15642423239 has 2 divisors, whose sum is σ = 15642423240. Its totient is φ = 15642423238.

The previous prime is 15642423193. The next prime is 15642423259. The reversal of 15642423239 is 93232424651.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15642423239 is a prime.

It is a super-2 number, since 2×15642423239² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15642423196 and 15642423205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15642423259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7821211619 + 7821211620.

It is an arithmetic number, because the mean of its divisors is an integer number (7821211620).

Almost surely, 2^15642423239 is an apocalyptic number.

15642423239 is a deficient number, since it is larger than the sum of its proper divisors (1).

15642423239 is an equidigital number, since it uses as much as digits as its factorization.

15642423239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 41.

The spelling of 15642423239 in words is "fifteen billion, six hundred forty-two million, four hundred twenty-three thousand, two hundred thirty-nine".