1251264012775 has 12 divisors (see below), whose sum is σ = 1773219858352. Its totient is φ = 858009608640.

The previous prime is 1251264012773. The next prime is 1251264012857. The reversal of 1251264012775 is 5772104621521.

It is not a de Polignac number, because 1251264012775 - 2¹ = 1251264012773 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251264012773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3575039862 + ... + 3575040211.

Almost surely, 2^{1251264012775} is an apocalyptic number.

1251264012775 is a deficient number, since it is larger than the sum of its proper divisors (521955845577).

1251264012775 is an equidigital number, since it uses as much as digits as its factorization.

1251264012775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7150080090 (or 7150080085 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 1251264012775 in words is "one trillion, two hundred fifty-one billion, two hundred sixty-four million, twelve thousand, seven hundred seventy-five".