27477747775 has 12 divisors (see below), whose sum is σ = 34074859000. Its totient is φ = 21980616480.

The previous prime is 27477747749. The next prime is 27477747797. The reversal of 27477747775 is 57774777472.

It is a happy number.

It is not a de Polignac number, because 27477747775 - 2⁹ = 27477747263 is a prime.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 419176 + ... + 480274.

Almost surely, 2^27477747775 is an apocalyptic number.

27477747775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

27477747775 is a deficient number, since it is larger than the sum of its proper divisors (6597111225).

27477747775 is a wasteful number, since it uses less digits than its factorization.

27477747775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79098 (or 79093 counting only the distinct ones).

The product of its digits is 131766880, while the sum is 64.

The spelling of 27477747775 in words is "twenty-seven billion, four hundred seventy-seven million, seven hundred forty-seven thousand, seven hundred seventy-five".