1265853867274 has 4 divisors (see below), whose sum is σ = 1898780800914. Its totient is φ = 632926933636.

The previous prime is 1265853867181. The next prime is 1265853867283. The reversal of 1265853867274 is 4727683585621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 925457468049 + 340396399225 = 962007^2 + 583435^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316463466817 + ... + 316463466820.

Almost surely, 2^{1265853867274} is an apocalyptic number.

1265853867274 is a deficient number, since it is larger than the sum of its proper divisors (632926933640).

1265853867274 is an equidigital number, since it uses as much as digits as its factorization.

1265853867274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632926933639.

The product of its digits is 135475200, while the sum is 64.

The spelling of 1265853867274 in words is "one trillion, two hundred sixty-five billion, eight hundred fifty-three million, eight hundred sixty-seven thousand, two hundred seventy-four".