66860631 has 24 divisors (see below), whose sum is σ = 100835280. Its totient is φ = 42637056.

The previous prime is 66860611. The next prime is 66860641. The reversal of 66860631 is 13606866.

It is not a de Polignac number, because 66860631 - 2⁷ = 66860503 is a prime.

It is a super-2 number, since 2×66860631² = 8940687955436322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66860611) 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 23 ways as a sum of consecutive naturals, for example, 28360 + ... + 30626.

It is an arithmetic number, because the mean of its divisors is an integer number (4201470).

Almost surely, 2^66860631 is an apocalyptic number.

66860631 is a deficient number, since it is larger than the sum of its proper divisors (33974649).

66860631 is a wasteful number, since it uses less digits than its factorization.

66860631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415 (or 2412 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 66860631 is about 8176.8350234061. The cubic root of 66860631 is about 405.8729956959.

The spelling of 66860631 in words is "sixty-six million, eight hundred sixty thousand, six hundred thirty-one".