12777185055869 has 36 divisors (see below), whose sum is σ = 14031378350388. Its totient is φ = 11628565079040.

The previous prime is 12777185055863. The next prime is 12777185055893. The reversal of 12777185055869 is 96855058177721.

It can be written as a sum of positive squares in 6 ways, for example, as 23444203225 + 12753740852644 = 153115^2 + 3571238^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12777185055869 is a prime.

It is a super-2 number, since 2×12777185055869² (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 (12777185055863) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1203913007 + ... + 1203923619.

It is an arithmetic number, because the mean of its divisors is an integer number (389760509733).

Almost surely, 2^{12777185055869} is an apocalyptic number.

It is an amenable number.

12777185055869 is a deficient number, since it is larger than the sum of its proper divisors (1254193294519).

12777185055869 is an equidigital number, since it uses as much as digits as its factorization.

12777185055869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11278 (or 10994 counting only the distinct ones).

The product of its (nonzero) digits is 296352000, while the sum is 71.

The spelling of 12777185055869 in words is "twelve trillion, seven hundred seventy-seven billion, one hundred eighty-five million, fifty-five thousand, eight hundred sixty-nine".