66644042 has 16 divisors (see below), whose sum is σ = 101347200. Its totient is φ = 32864400.

The previous prime is 66644033. The next prime is 66644057. The reversal of 66644042 is 24044666.

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, 72059 + ... + 72977.

It is an arithmetic number, because the mean of its divisors is an integer number (6334200).

Almost surely, 2^66644042 is an apocalyptic number.

66644042 is a deficient number, since it is larger than the sum of its proper divisors (34703158).

66644042 is a wasteful number, since it uses less digits than its factorization.

66644042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 66644042 is about 8163.5802194870. The cubic root of 66644042 is about 405.4342585841.

The spelling of 66644042 in words is "sixty-six million, six hundred forty-four thousand, forty-two".