27777655668 has 72 divisors (see below), whose sum is σ = 75434097312. Its totient is φ = 7932515136.

The previous prime is 27777655667. The next prime is 27777655729. The reversal of 27777655668 is 86655677772.

It is a junction number, because it is equal to n+sod(n) for n = 27777655599 and 27777655608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27777655667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1290571 + ... + 1311917.

It is an arithmetic number, because the mean of its divisors is an integer number (1047695796).

Almost surely, 2^27777655668 is an apocalyptic number.

27777655668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

27777655668 is an abundant number, since it is smaller than the sum of its proper divisors (47656441644).

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

27777655668 is a wasteful number, since it uses less digits than its factorization.

27777655668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23581 (or 23572 counting only the distinct ones).

The product of its digits is 207446400, while the sum is 66.

The spelling of 27777655668 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred fifty-five thousand, six hundred sixty-eight".