668739595201 has 2 divisors, whose sum is σ = 668739595202. Its totient is φ = 668739595200.

The previous prime is 668739595169. The next prime is 668739595243. The reversal of 668739595201 is 102595937866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 494984009601 + 173755585600 = 703551^2 + 416840^2 .

It is a cyclic number.

It is not a de Polignac number, because 668739595201 - 2⁵ = 668739595169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668739595201.

It is not a weakly prime, because it can be changed into another prime (668739595001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334369797600 + 334369797601.

It is an arithmetic number, because the mean of its divisors is an integer number (334369797601).

Almost surely, 2^668739595201 is an apocalyptic number.

It is an amenable number.

668739595201 is a deficient number, since it is larger than the sum of its proper divisors (1).

668739595201 is an equidigital number, since it uses as much as digits as its factorization.

668739595201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24494400, while the sum is 61.

The spelling of 668739595201 in words is "six hundred sixty-eight billion, seven hundred thirty-nine million, five hundred ninety-five thousand, two hundred one".