264820640857 has 2 divisors, whose sum is σ = 264820640858. Its totient is φ = 264820640856.

The previous prime is 264820640789. The next prime is 264820640897. The reversal of 264820640857 is 758046028462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186655105296 + 78165535561 = 432036^2 + 279581^2 .

It is a cyclic number.

It is not a de Polignac number, because 264820640857 - 2¹¹ = 264820638809 is a prime.

It is not a weakly prime, because it can be changed into another prime (264820640897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132410320428 + 132410320429.

It is an arithmetic number, because the mean of its divisors is an integer number (132410320429).

Almost surely, 2^264820640857 is an apocalyptic number.

It is an amenable number.

264820640857 is a deficient number, since it is larger than the sum of its proper divisors (1).

264820640857 is an equidigital number, since it uses as much as digits as its factorization.

264820640857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5160960, while the sum is 52.

The spelling of 264820640857 in words is "two hundred sixty-four billion, eight hundred twenty million, six hundred forty thousand, eight hundred fifty-seven".