27777668525 has 12 divisors (see below), whose sum is σ = 34663704372. Its totient is φ = 22080589440.

The previous prime is 27777668497. The next prime is 27777668539. The reversal of 27777668525 is 52586677772.

It can be written as a sum of positive squares in 6 ways, for example, as 7773243556 + 20004424969 = 88166^2 + 141437^2 .

It is not a de Polignac number, because 27777668525 - 2⁶ = 27777668461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3534632 + ... + 3542481.

It is an arithmetic number, because the mean of its divisors is an integer number (2888642031).

Almost surely, 2^27777668525 is an apocalyptic number.

27777668525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

27777668525 is a deficient number, since it is larger than the sum of its proper divisors (6886035847).

27777668525 is a wasteful number, since it uses less digits than its factorization.

27777668525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7077280 (or 7077275 counting only the distinct ones).

The product of its digits is 69148800, while the sum is 62.

The spelling of 27777668525 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred sixty-eight thousand, five hundred twenty-five".