27815518377 has 12 divisors (see below), whose sum is σ = 40467022960. Its totient is φ = 18410270328.

The previous prime is 27815518363. The next prime is 27815518387. The reversal of 27815518377 is 77381551872.

27815518377 is a `hidden beast` number, since 2 + 7 + 8 + 1 + 551 + 83 + 7 + 7 = 666.

It is not a de Polignac number, because 27815518377 - 2⁷ = 27815518249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27815518387) by changing a digit.

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, 11116063 + ... + 11118564.

Almost surely, 2^27815518377 is an apocalyptic number.

It is an amenable number.

27815518377 is a deficient number, since it is larger than the sum of its proper divisors (12651504583).

27815518377 is a wasteful number, since it uses less digits than its factorization.

27815518377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22234772 (or 22234769 counting only the distinct ones).

The product of its digits is 3292800, while the sum is 54.

The spelling of 27815518377 in words is "twenty-seven billion, eight hundred fifteen million, five hundred eighteen thousand, three hundred seventy-seven".