667327690657 has 2 divisors, whose sum is σ = 667327690658. Its totient is φ = 667327690656.

The previous prime is 667327690639. The next prime is 667327690709. The reversal of 667327690657 is 756096723766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 476764011361 + 190563679296 = 690481^2 + 436536^2 .

It is a cyclic number.

It is not a de Polignac number, because 667327690657 - 2¹⁵ = 667327657889 is a prime.

It is not a weakly prime, because it can be changed into another prime (667327690457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333663845328 + 333663845329.

It is an arithmetic number, because the mean of its divisors is an integer number (333663845329).

Almost surely, 2^667327690657 is an apocalyptic number.

It is an amenable number.

667327690657 is a deficient number, since it is larger than the sum of its proper divisors (1).

667327690657 is an equidigital number, since it uses as much as digits as its factorization.

667327690657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120022560, while the sum is 64.

The spelling of 667327690657 in words is "six hundred sixty-seven billion, three hundred twenty-seven million, six hundred ninety thousand, six hundred fifty-seven".