642066574 has 16 divisors (see below), whose sum is σ = 1064091168. Its totient is φ = 289011712.

The previous prime is 642066547. The next prime is 642066589. The reversal of 642066574 is 475660246.

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, 409747 + ... + 411310.

It is an arithmetic number, because the mean of its divisors is an integer number (66505698).

Almost surely, 2^642066574 is an apocalyptic number.

642066574 is a deficient number, since it is larger than the sum of its proper divisors (422024594).

642066574 is a wasteful number, since it uses less digits than its factorization.

642066574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821099.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 642066574 is about 25339.0326176829. The cubic root of 642066574 is about 862.7004416593.

The spelling of 642066574 in words is "six hundred forty-two million, sixty-six thousand, five hundred seventy-four".