27777655667 has 2 divisors, whose sum is σ = 27777655668. Its totient is φ = 27777655666.

The previous prime is 27777655643. The next prime is 27777655729. The reversal of 27777655667 is 76655677772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27777655667 - 2¹⁶ = 27777590131 is a prime.

It is not a weakly prime, because it can be changed into another prime (27777355667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13888827833 + 13888827834.

It is an arithmetic number, because the mean of its divisors is an integer number (13888827834).

Almost surely, 2^27777655667 is an apocalyptic number.

27777655667 is a deficient number, since it is larger than the sum of its proper divisors (1).

27777655667 is an equidigital number, since it uses as much as digits as its factorization.

27777655667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181515600, while the sum is 65.

The spelling of 27777655667 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred fifty-five thousand, six hundred sixty-seven".