81640116204 has 24 divisors (see below), whose sum is σ = 190588105008. Its totient is φ = 27199872000.

The previous prime is 81640116193. The next prime is 81640116223. The reversal of 81640116204 is 40261104618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1662297 + ... + 1710704.

It is an arithmetic number, because the mean of its divisors is an integer number (7941171042).

Almost surely, 2^81640116204 is an apocalyptic number.

It is an amenable number.

81640116204 is an abundant number, since it is smaller than the sum of its proper divisors (108947988804).

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

81640116204 is a wasteful number, since it uses less digits than its factorization.

81640116204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3375025 (or 3375023 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 81640116204 in words is "eighty-one billion, six hundred forty million, one hundred sixteen thousand, two hundred four".