12777751652789 has 4 divisors (see below), whose sum is σ = 12777762316620. Its totient is φ = 12777740988960.

The previous prime is 12777751652759. The next prime is 12777751652807. The reversal of 12777751652789 is 98725615777721.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5534209200100 + 7243542452689 = 2352490^2 + 2691383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12777751652789 is a prime.

It is a super-2 number, since 2×12777751652789² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12777751652759) 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, 3268352 + ... + 6019769.

It is an arithmetic number, because the mean of its divisors is an integer number (3194440579155).

Almost surely, 2^{12777751652789} is an apocalyptic number.

It is an amenable number.

12777751652789 is a deficient number, since it is larger than the sum of its proper divisors (10663831).

12777751652789 is an equidigital number, since it uses as much as digits as its factorization.

12777751652789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10663830.

The product of its digits is 726062400, while the sum is 74.

The spelling of 12777751652789 in words is "twelve trillion, seven hundred seventy-seven billion, seven hundred fifty-one million, six hundred fifty-two thousand, seven hundred eighty-nine".