664570042 has 4 divisors (see below), whose sum is σ = 996855066. Its totient is φ = 332285020.

The previous prime is 664570037. The next prime is 664570043. The reversal of 664570042 is 240075466.

664570042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 654387561 + 10182481 = 25581^2 + 3191^2 .

It is not an unprimeable number, because it can be changed into a prime (664570043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166142509 + ... + 166142512.

Almost surely, 2^664570042 is an apocalyptic number.

664570042 is a deficient number, since it is larger than the sum of its proper divisors (332285024).

664570042 is a wasteful number, since it uses less digits than its factorization.

664570042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332285023.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 664570042 is about 25779.2560404679. The cubic root of 664570042 is about 872.6637178512.

The spelling of 664570042 in words is "six hundred sixty-four million, five hundred seventy thousand, forty-two".