27777668616 has 24 divisors (see below), whose sum is σ = 75231186030. Its totient is φ = 9259222848.

The previous prime is 27777668603. The next prime is 27777668641. The reversal of 27777668616 is 61686677772.

It is a happy number.

27777668616 is a `hidden beast` number, since 2 + 7 + 7 + 7 + 7 + 6 + 6 + 8 + 616 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15938052516 + 11839616100 = 126246^2 + 108810^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×27777668616² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 192900405 + ... + 192900548.

Almost surely, 2^27777668616 is an apocalyptic number.

It is an amenable number.

27777668616 is an abundant number, since it is smaller than the sum of its proper divisors (47453517414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27777668616 is a wasteful number, since it uses less digits than its factorization.

27777668616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385800965 (or 385800958 counting only the distinct ones).

The product of its digits is 49787136, while the sum is 63.

The spelling of 27777668616 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred sixty-eight thousand, six hundred sixteen".