66715654601 has 2 divisors, whose sum is σ = 66715654602. Its totient is φ = 66715654600.

The previous prime is 66715654591. The next prime is 66715654619. The reversal of 66715654601 is 10645651766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64758034576 + 1957620025 = 254476^2 + 44245^2 .

It is a cyclic number.

It is not a de Polignac number, because 66715654601 - 2¹⁴ = 66715638217 is a prime.

It is not a weakly prime, because it can be changed into another prime (66715654501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33357827300 + 33357827301.

It is an arithmetic number, because the mean of its divisors is an integer number (33357827301).

Almost surely, 2^66715654601 is an apocalyptic number.

It is an amenable number.

66715654601 is a deficient number, since it is larger than the sum of its proper divisors (1).

66715654601 is an equidigital number, since it uses as much as digits as its factorization.

66715654601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 66715654601 in words is "sixty-six billion, seven hundred fifteen million, six hundred fifty-four thousand, six hundred one".