642567557522 has 30 divisors (see below), whose sum is σ = 1064127685719. Its totient is φ = 290789483380.

The previous prime is 642567557521. The next prime is 642567557531. The reversal of 642567557522 is 225755765246.

It can be written as a sum of positive squares in only one way, i.e., 321283778761 + 321283778761 = 566819^2 + 566819^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=566819.

It is a Duffinian number.

Its product of digits (35280000) is a multiple of the sum of its prime divisors (240).

It is not an unprimeable number, because it can be changed into a prime (642567557521) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2830693973 + ... + 2830694199.

Almost surely, 2^642567557522 is an apocalyptic number.

642567557522 is a deficient number, since it is larger than the sum of its proper divisors (421560128197).

642567557522 is an frugal number, since it uses more digits than its factorization.

642567557522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932 (or 240 counting only the distinct ones).

The product of its digits is 35280000, while the sum is 56.

The spelling of 642567557522 in words is "six hundred forty-two billion, five hundred sixty-seven million, five hundred fifty-seven thousand, five hundred twenty-two".