81893370823 has 8 divisors (see below), whose sum is σ = 89346638736. Its totient is φ = 74441505600.

The previous prime is 81893370791. The next prime is 81893370859. The reversal of 81893370823 is 32807339818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81893370823 - 2⁵ = 81893370791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81893370863) 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 7 ways as a sum of consecutive naturals, for example, 226686 + ... + 463867.

It is an arithmetic number, because the mean of its divisors is an integer number (11168329842).

Almost surely, 2^81893370823 is an apocalyptic number.

81893370823 is a deficient number, since it is larger than the sum of its proper divisors (7453267913).

81893370823 is a wasteful number, since it uses less digits than its factorization.

81893370823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701345.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 81893370823 in words is "eighty-one billion, eight hundred ninety-three million, three hundred seventy thousand, eight hundred twenty-three".