81886657800 has 48 divisors (see below), whose sum is σ = 253848641040. Its totient is φ = 21836441920.

The previous prime is 81886657799. The next prime is 81886657813. The reversal of 81886657800 is 875668818.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68238282 + ... + 68239481.

It is an arithmetic number, because the mean of its divisors is an integer number (5288513355).

Almost surely, 2^81886657800 is an apocalyptic number.

It is an amenable number.

81886657800 is an abundant number, since it is smaller than the sum of its proper divisors (171961983240).

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

81886657800 is a wasteful number, since it uses less digits than its factorization.

81886657800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136477782 (or 136477773 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 57.

The spelling of 81886657800 in words is "eighty-one billion, eight hundred eighty-six million, six hundred fifty-seven thousand, eight hundred".