1265260751257 has 2 divisors, whose sum is σ = 1265260751258. Its totient is φ = 1265260751256.

The previous prime is 1265260751191. The next prime is 1265260751273. The reversal of 1265260751257 is 7521570625621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1097442712921 + 167818038336 = 1047589^2 + 409656^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265260751257 - 2³⁹ = 715504937369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1265260751257.

It is not a weakly prime, because it can be changed into another prime (1265260754257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632630375628 + 632630375629.

It is an arithmetic number, because the mean of its divisors is an integer number (632630375629).

Almost surely, 2^{1265260751257} is an apocalyptic number.

It is an amenable number.

1265260751257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265260751257 is an equidigital number, since it uses as much as digits as its factorization.

1265260751257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764000, while the sum is 49.

The spelling of 1265260751257 in words is "one trillion, two hundred sixty-five billion, two hundred sixty million, seven hundred fifty-one thousand, two hundred fifty-seven".