253387018657 has 2 divisors, whose sum is σ = 253387018658. Its totient is φ = 253387018656.

The previous prime is 253387018639. The next prime is 253387018693. The reversal of 253387018657 is 756810783352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253335048976 + 51969681 = 503324^2 + 7209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253387018657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 253387018598 and 253387018607.

It is not a weakly prime, because it can be changed into another prime (253387018607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126693509328 + 126693509329.

It is an arithmetic number, because the mean of its divisors is an integer number (126693509329).

Almost surely, 2^253387018657 is an apocalyptic number.

It is an amenable number.

253387018657 is a deficient number, since it is larger than the sum of its proper divisors (1).

253387018657 is an equidigital number, since it uses as much as digits as its factorization.

253387018657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8467200, while the sum is 55.

The spelling of 253387018657 in words is "two hundred fifty-three billion, three hundred eighty-seven million, eighteen thousand, six hundred fifty-seven".