81184078045794 has 64 divisors (see below), whose sum is σ = 165161900851200. Its totient is φ = 26599722746688.

The previous prime is 81184078045723. The next prime is 81184078045831. The reversal of 81184078045794 is 49754087048118.

It is a happy number.

It is a super-2 number, since 2×81184078045794² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1194921477 + ... + 1194989415.

It is an arithmetic number, because the mean of its divisors is an integer number (2580654700800).

Almost surely, 2^{81184078045794} is an apocalyptic number.

81184078045794 is an abundant number, since it is smaller than the sum of its proper divisors (83977822805406).

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

81184078045794 is a wasteful number, since it uses less digits than its factorization.

81184078045794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82567.

The product of its (nonzero) digits is 72253440, while the sum is 66.

The spelling of 81184078045794 in words is "eighty-one trillion, one hundred eighty-four billion, seventy-eight million, forty-five thousand, seven hundred ninety-four".