66317939 has 2 divisors, whose sum is σ = 66317940. Its totient is φ = 66317938.

The previous prime is 66317929. The next prime is 66318013. The reversal of 66317939 is 93971366.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66317939 - 2²⁰ = 65269363 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66317939.

It is not a weakly prime, because it can be changed into another prime (66317929) 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, 33158969 + 33158970.

It is an arithmetic number, because the mean of its divisors is an integer number (33158970).

Almost surely, 2^66317939 is an apocalyptic number.

66317939 is a deficient number, since it is larger than the sum of its proper divisors (1).

66317939 is an equidigital number, since it uses as much as digits as its factorization.

66317939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 44.

The square root of 66317939 is about 8143.5826882276. The cubic root of 66317939 is about 404.7718859688.

The spelling of 66317939 in words is "sixty-six million, three hundred seventeen thousand, nine hundred thirty-nine".