66959333117813 has 2 divisors, whose sum is σ = 66959333117814. Its totient is φ = 66959333117812.

The previous prime is 66959333117779. The next prime is 66959333117851. The reversal of 66959333117813 is 31871133395966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43586430408004 + 23372902709809 = 6602002^2 + 4834553^2 .

It is a cyclic number.

It is not a de Polignac number, because 66959333117813 - 2⁸ = 66959333117557 is a prime.

It is a super-2 number, since 2×66959333117813² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66959333117813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66959333177813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33479666558906 + 33479666558907.

It is an arithmetic number, because the mean of its divisors is an integer number (33479666558907).

Almost surely, 2^{66959333117813} is an apocalyptic number.

It is an amenable number.

66959333117813 is a deficient number, since it is larger than the sum of its proper divisors (1).

66959333117813 is an equidigital number, since it uses as much as digits as its factorization.

66959333117813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66134880, while the sum is 65.

The spelling of 66959333117813 in words is "sixty-six trillion, nine hundred fifty-nine billion, three hundred thirty-three million, one hundred seventeen thousand, eight hundred thirteen".