81858672200 has 36 divisors (see below), whose sum is σ = 190330820745. Its totient is φ = 32741850400.

The previous prime is 81858672179. The next prime is 81858672227. The reversal of 81858672200 is 227685818.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 80221498756 + 1637173444 = 283234^2 + 40462^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=202310.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4036085 + ... + 4056315.

Almost surely, 2^81858672200 is an apocalyptic number.

It is an amenable number.

81858672200 is an abundant number, since it is smaller than the sum of its proper divisors (108472148545).

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

81858672200 is an frugal number, since it uses more digits than its factorization.

81858672200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40478 (or 20238 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 47.

The spelling of 81858672200 in words is "eighty-one billion, eight hundred fifty-eight million, six hundred seventy-two thousand, two hundred".