81719383044 has 96 divisors (see below), whose sum is σ = 222728679936. Its totient is φ = 23088107520.

The previous prime is 81719382977. The next prime is 81719383079. The reversal of 81719383044 is 44038391718.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81719382984 and 81719383002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 267052 + ... + 484515.

It is an arithmetic number, because the mean of its divisors is an integer number (2320090416).

Almost surely, 2^81719383044 is an apocalyptic number.

It is an amenable number.

81719383044 is an abundant number, since it is smaller than the sum of its proper divisors (141009296892).

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

81719383044 is a wasteful number, since it uses less digits than its factorization.

81719383044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751645 (or 751643 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 81719383044 in words is "eighty-one billion, seven hundred nineteen million, three hundred eighty-three thousand, forty-four".