66774664 has 32 divisors (see below), whose sum is σ = 143776800. Its totient is φ = 28753920.

The previous prime is 66774661. The next prime is 66774707. The reversal of 66774664 is 46647766.

It is not an unprimeable number, because it can be changed into a prime (66774661) 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, 18297 + ... + 21640.

It is an arithmetic number, because the mean of its divisors is an integer number (4493025).

Almost surely, 2^66774664 is an apocalyptic number.

It is an amenable number.

66774664 is an abundant number, since it is smaller than the sum of its proper divisors (77002136).

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

66774664 is a wasteful number, since it uses less digits than its factorization.

66774664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39973 (or 39969 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 46.

The square root of 66774664 is about 8171.5765920659. The cubic root of 66774664 is about 405.6989687778.

The spelling of 66774664 in words is "sixty-six million, seven hundred seventy-four thousand, six hundred sixty-four".