66577231 has 12 divisors (see below), whose sum is σ = 77750280. Its totient is φ = 56842800.

The previous prime is 66577207. The next prime is 66577237. The reversal of 66577231 is 13277566.

It is not a de Polignac number, because 66577231 - 2²³ = 58188623 is a prime.

It is a super-2 number, since 2×66577231² = 8865055375254722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66577237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10656 + ... + 15706.

It is an arithmetic number, because the mean of its divisors is an integer number (6479190).

Almost surely, 2^66577231 is an apocalyptic number.

66577231 is a deficient number, since it is larger than the sum of its proper divisors (11173049).

66577231 is a wasteful number, since it uses less digits than its factorization.

66577231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5334 (or 5327 counting only the distinct ones).

The product of its digits is 52920, while the sum is 37.

The square root of 66577231 is about 8159.4871775131. The cubic root of 66577231 is about 405.2987299644.

The spelling of 66577231 in words is "sixty-six million, five hundred seventy-seven thousand, two hundred thirty-one".