642146564 has 6 divisors (see below), whose sum is σ = 1123756494. Its totient is φ = 321073280.

The previous prime is 642146543. The next prime is 642146579. The reversal of 642146564 is 465641246.

It can be written as a sum of positive squares in only one way, i.e., 339664900 + 302481664 = 18430^2 + 17392^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80268317 + ... + 80268324.

It is an arithmetic number, because the mean of its divisors is an integer number (187292749).

Almost surely, 2^642146564 is an apocalyptic number.

It is an amenable number.

642146564 is a deficient number, since it is larger than the sum of its proper divisors (481609930).

642146564 is a wasteful number, since it uses less digits than its factorization.

642146564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160536645 (or 160536643 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The square root of 642146564 is about 25340.6109634318. The cubic root of 642146564 is about 862.7362658483.

The spelling of 642146564 in words is "six hundred forty-two million, one hundred forty-six thousand, five hundred sixty-four".