66679117639 has 2 divisors, whose sum is σ = 66679117640. Its totient is φ = 66679117638.

The previous prime is 66679117621. The next prime is 66679117741. The reversal of 66679117639 is 93671197666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66679117639 - 2⁵ = 66679117607 is a prime.

It is a super-2 number, since 2×66679117639² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66679117139) 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, 33339558819 + 33339558820.

It is an arithmetic number, because the mean of its divisors is an integer number (33339558820).

Almost surely, 2^66679117639 is an apocalyptic number.

66679117639 is a deficient number, since it is larger than the sum of its proper divisors (1).

66679117639 is an equidigital number, since it uses as much as digits as its factorization.

66679117639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15431472, while the sum is 61.

The spelling of 66679117639 in words is "sixty-six billion, six hundred seventy-nine million, one hundred seventeen thousand, six hundred thirty-nine".