66663564 has 24 divisors (see below), whose sum is σ = 169689408. Its totient is φ = 20201040.

The previous prime is 66663563. The next prime is 66663587. The reversal of 66663564 is 46536666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66663563) 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, 252382 + ... + 252645.

It is an arithmetic number, because the mean of its divisors is an integer number (7070392).

Almost surely, 2^66663564 is an apocalyptic number.

It is an amenable number.

66663564 is an abundant number, since it is smaller than the sum of its proper divisors (103025844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66663564 is a wasteful number, since it uses less digits than its factorization.

66663564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505045 (or 505043 counting only the distinct ones).

The product of its digits is 466560, while the sum is 42.

The square root of 66663564 is about 8164.7758083122. The cubic root of 66663564 is about 405.4738425922.

The spelling of 66663564 in words is "sixty-six million, six hundred sixty-three thousand, five hundred sixty-four".