666310901 has 2 divisors, whose sum is σ = 666310902. Its totient is φ = 666310900.

The previous prime is 666310831. The next prime is 666310951. The reversal of 666310901 is 109013666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665588401 + 722500 = 25799^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 666310901 - 2²² = 662116597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666310951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333155450 + 333155451.

It is an arithmetic number, because the mean of its divisors is an integer number (333155451).

Almost surely, 2^666310901 is an apocalyptic number.

It is an amenable number.

666310901 is a deficient number, since it is larger than the sum of its proper divisors (1).

666310901 is an equidigital number, since it uses as much as digits as its factorization.

666310901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 666310901 is about 25812.9986828342. The cubic root of 666310901 is about 873.4250421178.

The spelling of 666310901 in words is "six hundred sixty-six million, three hundred ten thousand, nine hundred one".