66213164 has 24 divisors (see below), whose sum is σ = 123642288. Its totient is φ = 30917120.

The previous prime is 66213131. The next prime is 66213187. The reversal of 66213164 is 46131266.

It is a happy number.

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, 5192 + ... + 12624.

It is an arithmetic number, because the mean of its divisors is an integer number (5151762).

Almost surely, 2^66213164 is an apocalyptic number.

It is an amenable number.

66213164 is a deficient number, since it is larger than the sum of its proper divisors (57429124).

66213164 is a wasteful number, since it uses less digits than its factorization.

66213164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7585 (or 7583 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 66213164 is about 8137.1471659298. The cubic root of 66213164 is about 404.5586086919.

The spelling of 66213164 in words is "sixty-six million, two hundred thirteen thousand, one hundred sixty-four".