642023566 has 16 divisors (see below), whose sum is σ = 1014224400. Its totient is φ = 303965568.

The previous prime is 642023563. The next prime is 642023579. The reversal of 642023566 is 665320246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642023563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125670 + ... + 130678.

It is an arithmetic number, because the mean of its divisors is an integer number (63389025).

Almost surely, 2^642023566 is an apocalyptic number.

642023566 is a deficient number, since it is larger than the sum of its proper divisors (372200834).

642023566 is a wasteful number, since it uses less digits than its factorization.

642023566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8403.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 642023566 is about 25338.1839522883. The cubic root of 642023566 is about 862.6811789377.

The spelling of 642023566 in words is "six hundred forty-two million, twenty-three thousand, five hundred sixty-six".