81190979732880 has 120 divisors (see below), whose sum is σ = 282765128248512. Its totient is φ = 21650927923584.

The previous prime is 81190979732831. The next prime is 81190979732911. The reversal of 81190979732880 is 8823797909118.

81190979732880 is a `hidden beast` number, since 8 + 1 + 190 + 97 + 9 + 73 + 288 + 0 = 666.

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 (72).

It is a junction number, because it is equal to n+sod(n) for n = 81190979732799 and 81190979732808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2088225924 + ... + 2088264803.

Almost surely, 2^{81190979732880} is an apocalyptic number.

81190979732880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81190979732880 is an abundant number, since it is smaller than the sum of its proper divisors (201574148515632).

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

81190979732880 is a wasteful number, since it uses less digits than its factorization.

81190979732880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176490755 (or 4176490737 counting only the distinct ones).

The product of its (nonzero) digits is 109734912, while the sum is 72.

The spelling of 81190979732880 in words is "eighty-one trillion, one hundred ninety billion, nine hundred seventy-nine million, seven hundred thirty-two thousand, eight hundred eighty".