80861801800 has 72 divisors (see below), whose sum is σ = 203578044390. Its totient is φ = 29856652800.

The previous prime is 80861801701. The next prime is 80861801869. The reversal of 80861801800 is 810816808.

It can be written as a sum of positive squares in 9 ways, for example, as 977562756 + 79884239044 = 31266^2 + 282638^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 1162381 + ... + 1229980.

Almost surely, 2^80861801800 is an apocalyptic number.

It is an amenable number.

80861801800 is an abundant number, since it is smaller than the sum of its proper divisors (122716242590).

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

80861801800 is a wasteful number, since it uses less digits than its factorization.

80861801800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392403 (or 2392381 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 40.

The spelling of 80861801800 in words is "eighty billion, eight hundred sixty-one million, eight hundred one thousand, eight hundred".