660279899857 has 2 divisors, whose sum is σ = 660279899858. Its totient is φ = 660279899856.

The previous prime is 660279899821. The next prime is 660279899891. The reversal of 660279899857 is 758998972066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 576872149441 + 83407750416 = 759521^2 + 288804^2 .

It is a cyclic number.

It is not a de Polignac number, because 660279899857 - 2⁷ = 660279899729 is a prime.

It is not a weakly prime, because it can be changed into another prime (660279899897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330139949928 + 330139949929.

It is an arithmetic number, because the mean of its divisors is an integer number (330139949929).

Almost surely, 2^660279899857 is an apocalyptic number.

It is an amenable number.

660279899857 is a deficient number, since it is larger than the sum of its proper divisors (1).

660279899857 is an equidigital number, since it uses as much as digits as its factorization.

660279899857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 823011840, while the sum is 76.

The spelling of 660279899857 in words is "six hundred sixty billion, two hundred seventy-nine million, eight hundred ninety-nine thousand, eight hundred fifty-seven".