12777513887 has 2 divisors, whose sum is σ = 12777513888. Its totient is φ = 12777513886.

The previous prime is 12777513857. The next prime is 12777513907. The reversal of 12777513887 is 78831577721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12777513887 - 2⁸ = 12777513631 is a prime.

It is a super-2 number, since 2×12777513887² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12777513857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6388756943 + 6388756944.

It is an arithmetic number, because the mean of its divisors is an integer number (6388756944).

Almost surely, 2^12777513887 is an apocalyptic number.

12777513887 is a deficient number, since it is larger than the sum of its proper divisors (1).

12777513887 is an equidigital number, since it uses as much as digits as its factorization.

12777513887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4609920, while the sum is 56.

The spelling of 12777513887 in words is "twelve billion, seven hundred seventy-seven million, five hundred thirteen thousand, eight hundred eighty-seven".