66976231 has 16 divisors (see below), whose sum is σ = 78619968. Its totient is φ = 55872000.

The previous prime is 66976229. The next prime is 66976271. The reversal of 66976231 is 13267966.

It is a cyclic number.

It is not a de Polignac number, because 66976231 - 2¹ = 66976229 is a prime.

It is a super-2 number, since 2×66976231² = 8971631037930722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66976271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42351 + ... + 43903.

It is an arithmetic number, because the mean of its divisors is an integer number (4913748).

Almost surely, 2^66976231 is an apocalyptic number.

66976231 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

66976231 is a deficient number, since it is larger than the sum of its proper divisors (11643737).

66976231 is a wasteful number, since it uses less digits than its factorization.

66976231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722.

The product of its digits is 81648, while the sum is 40.

The square root of 66976231 is about 8183.9007203167. The cubic root of 66976231 is about 406.1067750420.

The spelling of 66976231 in words is "sixty-six million, nine hundred seventy-six thousand, two hundred thirty-one".