27557859897 has 6 divisors (see below), whose sum is σ = 39805797642. Its totient is φ = 18371906592.

The previous prime is 27557859887. The next prime is 27557859961. The reversal of 27557859897 is 79895875572.

27557859897 is a `hidden beast` number, since 27 + 5 + 5 + 7 + 8 + 598 + 9 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17632918521 + 9924941376 = 132789^2 + 99624^2 .

It is not a de Polignac number, because 27557859897 - 2²² = 27553665593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27557859887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1530992208 + ... + 1530992225.

It is an arithmetic number, because the mean of its divisors is an integer number (6634299607).

Almost surely, 2^27557859897 is an apocalyptic number.

It is an amenable number.

27557859897 is a deficient number, since it is larger than the sum of its proper divisors (12247937745).

27557859897 is a wasteful number, since it uses less digits than its factorization.

27557859897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3061984439 (or 3061984436 counting only the distinct ones).

The product of its digits is 444528000, while the sum is 72.

The spelling of 27557859897 in words is "twenty-seven billion, five hundred fifty-seven million, eight hundred fifty-nine thousand, eight hundred ninety-seven".