81080671100 has 72 divisors (see below), whose sum is σ = 206704717968. Its totient is φ = 27215884800.

The previous prime is 81080671081. The next prime is 81080671103. The reversal of 81080671100 is 117608018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81080671103) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2820689 + ... + 2849288.

Almost surely, 2^81080671100 is an apocalyptic number.

It is an amenable number.

81080671100 is an abundant number, since it is smaller than the sum of its proper divisors (125624046868).

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

81080671100 is a wasteful number, since it uses less digits than its factorization.

81080671100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5670015 (or 5670008 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 32.

The spelling of 81080671100 in words is "eighty-one billion, eighty million, six hundred seventy-one thousand, one hundred".