1255687028257 has 2 divisors, whose sum is σ = 1255687028258. Its totient is φ = 1255687028256.

The previous prime is 1255687028231. The next prime is 1255687028269. The reversal of 1255687028257 is 7528207865521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 656555298961 + 599131729296 = 810281^2 + 774036^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255687028257 - 2¹⁵ = 1255686995489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1255687028227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627843514128 + 627843514129.

It is an arithmetic number, because the mean of its divisors is an integer number (627843514129).

Almost surely, 2^{1255687028257} is an apocalyptic number.

It is an amenable number.

1255687028257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255687028257 is an equidigital number, since it uses as much as digits as its factorization.

1255687028257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816000, while the sum is 58.

The spelling of 1255687028257 in words is "one trillion, two hundred fifty-five billion, six hundred eighty-seven million, twenty-eight thousand, two hundred fifty-seven".