15642422557 has 2 divisors, whose sum is σ = 15642422558. Its totient is φ = 15642422556.

The previous prime is 15642422539. The next prime is 15642422561. The reversal of 15642422557 is 75522424651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15618500676 + 23921881 = 124974^2 + 4891^2 .

It is a cyclic number.

It is not a de Polignac number, because 15642422557 - 2²³ = 15634033949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15642422507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7821211278 + 7821211279.

It is an arithmetic number, because the mean of its divisors is an integer number (7821211279).

Almost surely, 2^15642422557 is an apocalyptic number.

It is an amenable number.

15642422557 is a deficient number, since it is larger than the sum of its proper divisors (1).

15642422557 is an equidigital number, since it uses as much as digits as its factorization.

15642422557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672000, while the sum is 43.

The spelling of 15642422557 in words is "fifteen billion, six hundred forty-two million, four hundred twenty-two thousand, five hundred fifty-seven".