66769631 has 2 divisors, whose sum is σ = 66769632. Its totient is φ = 66769630.

The previous prime is 66769627. The next prime is 66769639. The reversal of 66769631 is 13696766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66769631 - 2² = 66769627 is a prime.

It is a super-2 number, since 2×66769631² = 8916367247752322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66769639) 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 as a sum of consecutive naturals, namely, 33384815 + 33384816.

It is an arithmetic number, because the mean of its divisors is an integer number (33384816).

Almost surely, 2^66769631 is an apocalyptic number.

66769631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66769631 is an equidigital number, since it uses as much as digits as its factorization.

66769631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 44.

The square root of 66769631 is about 8171.2686285546. The cubic root of 66769631 is about 405.6887756192.

The spelling of 66769631 in words is "sixty-six million, seven hundred sixty-nine thousand, six hundred thirty-one".