1265260754257 has 2 divisors, whose sum is σ = 1265260754258. Its totient is φ = 1265260754256.

The previous prime is 1265260754203. The next prime is 1265260754267. The reversal of 1265260754257 is 7524570625621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 872722166416 + 392538587841 = 934196^2 + 626529^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265260754257 - 2²⁷ = 1265126536529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265260754267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632630377128 + 632630377129.

It is an arithmetic number, because the mean of its divisors is an integer number (632630377129).

Almost surely, 2^{1265260754257} is an apocalyptic number.

It is an amenable number.

1265260754257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265260754257 is an equidigital number, since it uses as much as digits as its factorization.

1265260754257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056000, while the sum is 52.

The spelling of 1265260754257 in words is "one trillion, two hundred sixty-five billion, two hundred sixty million, seven hundred fifty-four thousand, two hundred fifty-seven".