27777137231 has 2 divisors, whose sum is σ = 27777137232. Its totient is φ = 27777137230.

The previous prime is 27777137207. The next prime is 27777137239. The reversal of 27777137231 is 13273177772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27777137231 - 2²² = 27772942927 is a prime.

It is a super-2 number, since 2×27777137231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27777137239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13888568615 + 13888568616.

It is an arithmetic number, because the mean of its divisors is an integer number (13888568616).

Almost surely, 2^27777137231 is an apocalyptic number.

27777137231 is a deficient number, since it is larger than the sum of its proper divisors (1).

27777137231 is an equidigital number, since it uses as much as digits as its factorization.

27777137231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 605052, while the sum is 47.

The spelling of 27777137231 in words is "twenty-seven billion, seven hundred seventy-seven million, one hundred thirty-seven thousand, two hundred thirty-one".