1265860609253 has 2 divisors, whose sum is σ = 1265860609254. Its totient is φ = 1265860609252.

The previous prime is 1265860609219. The next prime is 1265860609261. The reversal of 1265860609253 is 3529060685621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1164225894049 + 101634715204 = 1078993^2 + 318802^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265860609253 - 2⁸ = 1265860608997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1265860609195 and 1265860609204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265860609283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632930304626 + 632930304627.

It is an arithmetic number, because the mean of its divisors is an integer number (632930304627).

Almost surely, 2^{1265860609253} is an apocalyptic number.

It is an amenable number.

1265860609253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265860609253 is an equidigital number, since it uses as much as digits as its factorization.

1265860609253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4665600, while the sum is 53.

The spelling of 1265860609253 in words is "one trillion, two hundred sixty-five billion, eight hundred sixty million, six hundred nine thousand, two hundred fifty-three".