660566251297 has 2 divisors, whose sum is σ = 660566251298. Its totient is φ = 660566251296.

The previous prime is 660566251283. The next prime is 660566251309. The reversal of 660566251297 is 792152665066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 635733534241 + 24832717056 = 797329^2 + 157584^2 .

It is a cyclic number.

It is not a de Polignac number, because 660566251297 - 2²³ = 660557862689 is a prime.

It is not a weakly prime, because it can be changed into another prime (660566251097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330283125648 + 330283125649.

It is an arithmetic number, because the mean of its divisors is an integer number (330283125649).

Almost surely, 2^660566251297 is an apocalyptic number.

It is an amenable number.

660566251297 is a deficient number, since it is larger than the sum of its proper divisors (1).

660566251297 is an equidigital number, since it uses as much as digits as its factorization.

660566251297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8164800, while the sum is 55.

The spelling of 660566251297 in words is "six hundred sixty billion, five hundred sixty-six million, two hundred fifty-one thousand, two hundred ninety-seven".