81499880160 has 120 divisors (see below), whose sum is σ = 287626706136. Its totient is φ = 21733297920.

The previous prime is 81499880071. The next prime is 81499880167. The reversal of 81499880160 is 6108899418.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 81499880097 and 81499880106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81499880167) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3131326 + ... + 3157245.

Almost surely, 2^81499880160 is an apocalyptic number.

81499880160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81499880160 is an abundant number, since it is smaller than the sum of its proper divisors (206126825976).

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

81499880160 is a wasteful number, since it uses less digits than its factorization.

81499880160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6288598 (or 6288581 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The spelling of 81499880160 in words is "eighty-one billion, four hundred ninety-nine million, eight hundred eighty thousand, one hundred sixty".