27855400655780 has 12 divisors (see below), whose sum is σ = 58496341377180. Its totient is φ = 11142160262304.

The previous prime is 27855400655759. The next prime is 27855400655809. The reversal of 27855400655780 is 8755600455872.

It can be written as a sum of positive squares in 2 ways, for example, as 5275189181284 + 22580211474496 = 2296778^2 + 4751864^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696385016375 + ... + 696385016414.

It is an arithmetic number, because the mean of its divisors is an integer number (4874695114765).

Almost surely, 2^{27855400655780} is an apocalyptic number.

27855400655780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27855400655780 is an abundant number, since it is smaller than the sum of its proper divisors (30640940721400).

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

27855400655780 is a wasteful number, since it uses less digits than its factorization.

27855400655780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392770032798 (or 1392770032796 counting only the distinct ones).

The product of its (nonzero) digits is 94080000, while the sum is 62.

The spelling of 27855400655780 in words is "twenty-seven trillion, eight hundred fifty-five billion, four hundred million, six hundred fifty-five thousand, seven hundred eighty".