81459723354 has 8 divisors (see below), whose sum is σ = 162919446720. Its totient is φ = 27153241116.

The previous prime is 81459723307. The next prime is 81459723407. The reversal of 81459723354 is 45332795418.

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

81459723354 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 81459723297 and 81459723306.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6788310274 + ... + 6788310285.

It is an arithmetic number, because the mean of its divisors is an integer number (20364930840).

Almost surely, 2^81459723354 is an apocalyptic number.

81459723354 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81459723354 is a wasteful number, since it uses less digits than its factorization.

81459723354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13576620564.

The product of its digits is 3628800, while the sum is 51.

The spelling of 81459723354 in words is "eighty-one billion, four hundred fifty-nine million, seven hundred twenty-three thousand, three hundred fifty-four".