1256465057 has 2 divisors, whose sum is σ = 1256465058. Its totient is φ = 1256465056.

The previous prime is 1256465051. The next prime is 1256465099. The reversal of 1256465057 is 7505646521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 812478016 + 443987041 = 28504^2 + 21071^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256465057 - 2¹⁴ = 1256448673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256465051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628232528 + 628232529.

It is an arithmetic number, because the mean of its divisors is an integer number (628232529).

Almost surely, 2^1256465057 is an apocalyptic number.

It is an amenable number.

1256465057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256465057 is an equidigital number, since it uses as much as digits as its factorization.

1256465057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252000, while the sum is 41.

The square root of 1256465057 is about 35446.6508573095. The cubic root of 1256465057 is about 1079.0712915246.

The spelling of 1256465057 in words is "one billion, two hundred fifty-six million, four hundred sixty-five thousand, fifty-seven".