12765634757 has 4 divisors (see below), whose sum is σ = 12940506540. Its totient is φ = 12590762976.

The previous prime is 12765634751. The next prime is 12765634759. The reversal of 12765634757 is 75743656721.

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 8741128036 + 4024506721 = 93494^2 + 63439^2 .

It is a cyclic number.

It is not a de Polignac number, because 12765634757 - 2⁴ = 12765634741 is a prime.

It is a super-2 number, since 2×12765634757² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12765634699 and 12765634708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12765634751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87435782 + ... + 87435927.

It is an arithmetic number, because the mean of its divisors is an integer number (3235126635).

Almost surely, 2^12765634757 is an apocalyptic number.

It is an amenable number.

12765634757 is a deficient number, since it is larger than the sum of its proper divisors (174871783).

12765634757 is an equidigital number, since it uses as much as digits as its factorization.

12765634757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174871782.

The product of its digits is 7408800, while the sum is 53.

The spelling of 12765634757 in words is "twelve billion, seven hundred sixty-five million, six hundred thirty-four thousand, seven hundred fifty-seven".