66358566761 has 2 divisors, whose sum is σ = 66358566762. Its totient is φ = 66358566760.

The previous prime is 66358566739. The next prime is 66358566797. The reversal of 66358566761 is 16766585366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51050691136 + 15307875625 = 225944^2 + 123725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66358566761 is a prime.

It is a super-2 number, since 2×66358566761² (a number of 22 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 66358566761.

It is not a weakly prime, because it can be changed into another prime (66358560761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33179283380 + 33179283381.

It is an arithmetic number, because the mean of its divisors is an integer number (33179283381).

Almost surely, 2^66358566761 is an apocalyptic number.

It is an amenable number.

66358566761 is a deficient number, since it is larger than the sum of its proper divisors (1).

66358566761 is an equidigital number, since it uses as much as digits as its factorization.

66358566761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32659200, while the sum is 59.

The spelling of 66358566761 in words is "sixty-six billion, three hundred fifty-eight million, five hundred sixty-six thousand, seven hundred sixty-one".