1256700697597 has 2 divisors, whose sum is σ = 1256700697598. Its totient is φ = 1256700697596.

The previous prime is 1256700697561. The next prime is 1256700697627. The reversal of 1256700697597 is 7957960076521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1168331839236 + 88368858361 = 1080894^2 + 297269^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256700697597 - 2²⁷ = 1256566479869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256700697537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628350348798 + 628350348799.

It is an arithmetic number, because the mean of its divisors is an integer number (628350348799).

Almost surely, 2^{1256700697597} is an apocalyptic number.

It is an amenable number.

1256700697597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256700697597 is an equidigital number, since it uses as much as digits as its factorization.

1256700697597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50009400, while the sum is 64.

The spelling of 1256700697597 in words is "one trillion, two hundred fifty-six billion, seven hundred million, six hundred ninety-seven thousand, five hundred ninety-seven".