66976531 has 4 divisors (see below), whose sum is σ = 67057200. Its totient is φ = 66895864.

The previous prime is 66976477. The next prime is 66976541. The reversal of 66976531 is 13567966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66976531 - 2²⁵ = 33422099 is a prime.

It is a super-2 number, since 2×66976531² = 8971711409587922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66976541) 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 3 ways as a sum of consecutive naturals, for example, 39076 + ... + 40753.

It is an arithmetic number, because the mean of its divisors is an integer number (16764300).

Almost surely, 2^66976531 is an apocalyptic number.

66976531 is a deficient number, since it is larger than the sum of its proper divisors (80669).

66976531 is an equidigital number, since it uses as much as digits as its factorization.

66976531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80668.

The product of its digits is 204120, while the sum is 43.

The square root of 66976531 is about 8183.9190489643. The cubic root of 66976531 is about 406.1073813857.

The spelling of 66976531 in words is "sixty-six million, nine hundred seventy-six thousand, five hundred thirty-one".