66995772 has 24 divisors (see below), whose sum is σ = 156831696. Its totient is φ = 22259328.

The previous prime is 66995737. The next prime is 66995783. The reversal of 66995772 is 27759966.

It is a congruent 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, 5163 + ... + 12674.

It is an arithmetic number, because the mean of its divisors is an integer number (6534654).

Almost surely, 2^66995772 is an apocalyptic number.

It is an amenable number.

66995772 is an abundant number, since it is smaller than the sum of its proper divisors (89835924).

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

66995772 is a wasteful number, since it uses less digits than its factorization.

66995772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18157 (or 18155 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 51.

The square root of 66995772 is about 8185.0945015925. The cubic root of 66995772 is about 406.1462664691.

The spelling of 66995772 in words is "sixty-six million, nine hundred ninety-five thousand, seven hundred seventy-two".