12736877765 has 4 divisors (see below), whose sum is σ = 15284253324. Its totient is φ = 10189502208.

The previous prime is 12736877729. The next prime is 12736877767. The reversal of 12736877765 is 56777863721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9999600004 + 2737277761 = 99998^2 + 52319^2 .

It is a cyclic number.

It is not a de Polignac number, because 12736877765 - 2²² = 12732683461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12736877767) 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 in 3 ways as a sum of consecutive naturals, for example, 1273687772 + ... + 1273687781.

It is an arithmetic number, because the mean of its divisors is an integer number (3821063331).

Almost surely, 2^12736877765 is an apocalyptic number.

It is an amenable number.

12736877765 is a deficient number, since it is larger than the sum of its proper divisors (2547375559).

12736877765 is an equidigital number, since it uses as much as digits as its factorization.

12736877765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2547375558.

The product of its digits is 20744640, while the sum is 59.

The spelling of 12736877765 in words is "twelve billion, seven hundred thirty-six million, eight hundred seventy-seven thousand, seven hundred sixty-five".