27506661858 has 160 divisors (see below), whose sum is σ = 67377562560. Its totient is φ = 8337064320.

The previous prime is 27506661823. The next prime is 27506661877. The reversal of 27506661858 is 85816660572.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 49383316 + ... + 49383872.

It is an arithmetic number, because the mean of its divisors is an integer number (421109766).

Almost surely, 2^27506661858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27506661858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33688781280).

27506661858 is an abundant number, since it is smaller than the sum of its proper divisors (39870900702).

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

27506661858 is a wasteful number, since it uses less digits than its factorization.

27506661858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894 (or 885 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 27506661858 in words is "twenty-seven billion, five hundred six million, six hundred sixty-one thousand, eight hundred fifty-eight".