256770697 has 2 divisors, whose sum is σ = 256770698. Its totient is φ = 256770696.

The previous prime is 256770623. The next prime is 256770721. The reversal of 256770697 is 796077652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217533001 + 39237696 = 14749^2 + 6264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256770697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256770697.

It is not a weakly prime, because it can be changed into another prime (256770497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128385348 + 128385349.

It is an arithmetic number, because the mean of its divisors is an integer number (128385349).

Almost surely, 2^256770697 is an apocalyptic number.

It is an amenable number.

256770697 is a deficient number, since it is larger than the sum of its proper divisors (1).

256770697 is an equidigital number, since it uses as much as digits as its factorization.

256770697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1111320, while the sum is 49.

The square root of 256770697 is about 16024.0661818404. The cubic root of 256770697 is about 635.5969726499.

The spelling of 256770697 in words is "two hundred fifty-six million, seven hundred seventy thousand, six hundred ninety-seven".