66530631 has 8 divisors (see below), whose sum is σ = 89011440. Its totient is φ = 44201792.

The previous prime is 66530627. The next prime is 66530641. The reversal of 66530631 is 13603566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66530631 - 2² = 66530627 is a prime.

It is a super-2 number, since 2×66530631² = 8852649722516322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66530641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36966 + ... + 38723.

It is an arithmetic number, because the mean of its divisors is an integer number (11126430).

Almost surely, 2^66530631 is an apocalyptic number.

66530631 is a deficient number, since it is larger than the sum of its proper divisors (22480809).

66530631 is a wasteful number, since it uses less digits than its factorization.

66530631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75985.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 66530631 is about 8156.6311060388. The cubic root of 66530631 is about 405.2041464318.

It can be divided in two parts, 66530 and 631, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 66530631 in words is "sixty-six million, five hundred thirty thousand, six hundred thirty-one".