27231581916 has 144 divisors (see below), whose sum is σ = 88688400640. Its totient is φ = 7073114400.

The previous prime is 27231581887. The next prime is 27231581917. The reversal of 27231581916 is 61918513272.

27231581916 is a `hidden beast` number, since 27 + 2 + 31 + 581 + 9 + 16 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27231581917) 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 47 ways as a sum of consecutive naturals, for example, 57370 + ... + 240321.

Almost surely, 2^27231581916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27231581916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44344200320).

27231581916 is an abundant number, since it is smaller than the sum of its proper divisors (61456818724).

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

27231581916 is a wasteful number, since it uses less digits than its factorization.

27231581916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297733 (or 297714 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The spelling of 27231581916 in words is "twenty-seven billion, two hundred thirty-one million, five hundred eighty-one thousand, nine hundred sixteen".