642520566 has 16 divisors (see below), whose sum is σ = 1427823600. Its totient is φ = 214173504.

The previous prime is 642520507. The next prime is 642520583. The reversal of 642520566 is 665025246.

642520566 is a `hidden beast` number, since 6 + 42 + 52 + 0 + 566 = 666.

642520566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 642520566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5949211 + ... + 5949318.

It is an arithmetic number, because the mean of its divisors is an integer number (89238975).

Almost surely, 2^642520566 is an apocalyptic number.

642520566 is an abundant number, since it is smaller than the sum of its proper divisors (785303034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642520566 is a wasteful number, since it uses less digits than its factorization.

642520566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11898540 (or 11898534 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 642520566 is about 25347.9893877207. The cubic root of 642520566 is about 862.9037263028.

The spelling of 642520566 in words is "six hundred forty-two million, five hundred twenty thousand, five hundred sixty-six".