27777656645 has 16 divisors (see below), whose sum is σ = 34184462400. Its totient is φ = 21656914944.

The previous prime is 27777656639. The next prime is 27777656713. The reversal of 27777656645 is 54665677772.

It is a cyclic number.

It is not a de Polignac number, because 27777656645 - 2⁴ = 27777656629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47339 + ... + 240408.

It is an arithmetic number, because the mean of its divisors is an integer number (2136528900).

Almost surely, 2^27777656645 is an apocalyptic number.

It is an amenable number.

27777656645 is a deficient number, since it is larger than the sum of its proper divisors (6406805755).

27777656645 is a wasteful number, since it uses less digits than its factorization.

27777656645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288244.

The product of its digits is 103723200, while the sum is 62.

The spelling of 27777656645 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred fifty-six thousand, six hundred forty-five".