66644874 has 24 divisors (see below), whose sum is σ = 146228160. Its totient is φ = 21933288.

The previous prime is 66644873. The next prime is 66644887. The reversal of 66644874 is 47844666.

It is not an unprimeable number, because it can be changed into a prime (66644873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22012 + ... + 24855.

It is an arithmetic number, because the mean of its divisors is an integer number (6092840).

Almost surely, 2^66644874 is an apocalyptic number.

66644874 is an abundant number, since it is smaller than the sum of its proper divisors (79583286).

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

66644874 is a wasteful number, since it uses less digits than its factorization.

66644874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46954 (or 46951 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

The square root of 66644874 is about 8163.6311773622. The cubic root of 66644874 is about 405.4359457562.

The spelling of 66644874 in words is "sixty-six million, six hundred forty-four thousand, eight hundred seventy-four".