81401532200 has 48 divisors (see below), whose sum is σ = 189538432380. Its totient is φ = 32512463360.

The previous prime is 81401532193. The next prime is 81401532217. The reversal of 81401532200 is 223510418.

It can be written as a sum of positive squares in 6 ways, for example, as 56397700324 + 25003831876 = 237482^2 + 158126^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81401532200.

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, 165197 + ... + 435996.

Almost surely, 2^81401532200 is an apocalyptic number.

It is an amenable number.

81401532200 is an abundant number, since it is smaller than the sum of its proper divisors (108136900180).

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

81401532200 is a wasteful number, since it uses less digits than its factorization.

81401532200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601886 (or 601877 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 81401532200 in words is "eighty-one billion, four hundred one million, five hundred thirty-two thousand, two hundred".