64646566 has 16 divisors (see below), whose sum is σ = 97977600. Its totient is φ = 31989448.

The previous prime is 64646513. The next prime is 64646567. The reversal of 64646566 is 66564646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64646567) 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, 128271 + ... + 128773.

It is an arithmetic number, because the mean of its divisors is an integer number (6123600).

Almost surely, 2^64646566 is an apocalyptic number.

64646566 is a deficient number, since it is larger than the sum of its proper divisors (33331034).

64646566 is a wasteful number, since it uses less digits than its factorization.

64646566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043.

The product of its digits is 622080, while the sum is 43.

The square root of 64646566 is about 8040.3088249146. The cubic root of 64646566 is about 401.3425016822.

The spelling of 64646566 in words is "sixty-four million, six hundred forty-six thousand, five hundred sixty-six".