642204844562 has 6 divisors (see below), whose sum is σ = 963308966823. Its totient is φ = 321101855622.

The previous prime is 642204844553. The next prime is 642204844583. The reversal of 642204844562 is 265448402246.

It can be written as a sum of positive squares in only one way, i.e., 321102422281 + 321102422281 = 566659^2 + 566659^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=566659.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 849989 + ... + 1416647.

Almost surely, 2^642204844562 is an apocalyptic number.

642204844562 is a deficient number, since it is larger than the sum of its proper divisors (321104122261).

642204844562 is an frugal number, since it uses more digits than its factorization.

642204844562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133320 (or 566661 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 47.

The spelling of 642204844562 in words is "six hundred forty-two billion, two hundred four million, eight hundred forty-four thousand, five hundred sixty-two".