27777668481 has 12 divisors (see below), whose sum is σ = 40976986752. Its totient is φ = 18124435896.

The previous prime is 27777668467. The next prime is 27777668497. The reversal of 27777668481 is 18486677772.

27777668481 is a `hidden beast` number, since 27 + 7 + 7 + 76 + 68 + 481 = 666.

It is not a de Polignac number, because 27777668481 - 2²² = 27773474177 is a prime.

It is a super-2 number, since 2×27777668481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27777668411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32833701 + ... + 32834546.

It is an arithmetic number, because the mean of its divisors is an integer number (3414748896).

Almost surely, 2^27777668481 is an apocalyptic number.

It is an amenable number.

27777668481 is a deficient number, since it is larger than the sum of its proper divisors (13199318271).

27777668481 is a wasteful number, since it uses less digits than its factorization.

27777668481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65668300 (or 65668297 counting only the distinct ones).

The product of its digits is 44255232, while the sum is 63.

The spelling of 27777668481 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred sixty-eight thousand, four hundred eighty-one".