66358560761 has 2 divisors, whose sum is σ = 66358560762. Its totient is φ = 66358560760.

The previous prime is 66358560743. The next prime is 66358560773. The reversal of 66358560761 is 16706585366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66232110736 + 126450025 = 257356^2 + 11245^2 .

It is a cyclic number.

It is not a de Polignac number, because 66358560761 - 2³⁴ = 49178691577 is a prime.

It is not a weakly prime, because it can be changed into another prime (66358566761) 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, 33179280380 + 33179280381.

It is an arithmetic number, because the mean of its divisors is an integer number (33179280381).

Almost surely, 2^66358560761 is an apocalyptic number.

It is an amenable number.

66358560761 is a deficient number, since it is larger than the sum of its proper divisors (1).

66358560761 is an equidigital number, since it uses as much as digits as its factorization.

66358560761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 66358560761 in words is "sixty-six billion, three hundred fifty-eight million, five hundred sixty thousand, seven hundred sixty-one".