66297231 has 96 divisors (see below), whose sum is σ = 133468160. Its totient is φ = 31648320.

The previous prime is 66297227. The next prime is 66297239. The reversal of 66297231 is 13279266.

66297231 is a `hidden beast` number, since 6 + 629 + 7 + 23 + 1 = 666.

It is not a de Polignac number, because 66297231 - 2² = 66297227 is a prime.

It is a super-2 number, since 2×66297231² = 8790645676534722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66297239) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 297186 + ... + 297408.

Almost surely, 2^66297231 is an apocalyptic number.

66297231 is an abundant number, since it is smaller than the sum of its proper divisors (67170929).

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

66297231 is a wasteful number, since it uses less digits than its factorization.

66297231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 257 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 66297231 is about 8142.3111583874. The cubic root of 66297231 is about 404.7297511210.

The spelling of 66297231 in words is "sixty-six million, two hundred ninety-seven thousand, two hundred thirty-one".