12756143765 has 4 divisors (see below), whose sum is σ = 15307372524. Its totient is φ = 10204915008.

The previous prime is 12756143713. The next prime is 12756143773. The reversal of 12756143765 is 56734165721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56734165721 = 53 ⋅1070455957.

It can be written as a sum of positive squares in 2 ways, for example, as 7644179761 + 5111964004 = 87431^2 + 71498^2 .

It is a cyclic number.

It is not a de Polignac number, because 12756143765 - 2¹⁶ = 12756078229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1275614372 + ... + 1275614381.

It is an arithmetic number, because the mean of its divisors is an integer number (3826843131).

Almost surely, 2^12756143765 is an apocalyptic number.

It is an amenable number.

12756143765 is a deficient number, since it is larger than the sum of its proper divisors (2551228759).

12756143765 is an equidigital number, since it uses as much as digits as its factorization.

12756143765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551228758.

The product of its digits is 1058400, while the sum is 47.

The spelling of 12756143765 in words is "twelve billion, seven hundred fifty-six million, one hundred forty-three thousand, seven hundred sixty-five".