665407433857 has 2 divisors, whose sum is σ = 665407433858. Its totient is φ = 665407433856.

The previous prime is 665407433833. The next prime is 665407433881. The reversal of 665407433857 is 758334704566.

It is a balanced prime because it is at equal distance from previous prime (665407433833) and next prime (665407433881).

It can be written as a sum of positive squares in only one way, i.e., 592282620801 + 73124813056 = 769599^2 + 270416^2 .

It is a cyclic number.

It is not a de Polignac number, because 665407433857 - 2¹⁹ = 665406909569 is a prime.

It is not a weakly prime, because it can be changed into another prime (665407433557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332703716928 + 332703716929.

It is an arithmetic number, because the mean of its divisors is an integer number (332703716929).

Almost surely, 2^665407433857 is an apocalyptic number.

It is an amenable number.

665407433857 is a deficient number, since it is larger than the sum of its proper divisors (1).

665407433857 is an equidigital number, since it uses as much as digits as its factorization.

665407433857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50803200, while the sum is 58.

The spelling of 665407433857 in words is "six hundred sixty-five billion, four hundred seven million, four hundred thirty-three thousand, eight hundred fifty-seven".