27655565667 has 4 divisors (see below), whose sum is σ = 36874087560. Its totient is φ = 18437043776.

The previous prime is 27655565657. The next prime is 27655565681. The reversal of 27655565667 is 76656555672.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27655565667 - 2¹⁵ = 27655532899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27655565667.

It is not an unprimeable number, because it can be changed into a prime (27655565617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4609260942 + ... + 4609260947.

It is an arithmetic number, because the mean of its divisors is an integer number (9218521890).

Almost surely, 2^27655565667 is an apocalyptic number.

27655565667 is a deficient number, since it is larger than the sum of its proper divisors (9218521893).

27655565667 is an equidigital number, since it uses as much as digits as its factorization.

27655565667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9218521892.

The product of its digits is 79380000, while the sum is 60.

The spelling of 27655565667 in words is "twenty-seven billion, six hundred fifty-five million, five hundred sixty-five thousand, six hundred sixty-seven".