81461230223 has 4 divisors (see below), whose sum is σ = 81980091720. Its totient is φ = 80942368728.

The previous prime is 81461230217. The next prime is 81461230243. The reversal of 81461230223 is 32203216418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32203216418 = 2 ⋅16101608209.

It is a cyclic number.

It is not a de Polignac number, because 81461230223 - 2²⁴ = 81444453007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81461230223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81461230243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259430513 + ... + 259430826.

It is an arithmetic number, because the mean of its divisors is an integer number (20495022930).

Almost surely, 2^81461230223 is an apocalyptic number.

81461230223 is a deficient number, since it is larger than the sum of its proper divisors (518861497).

81461230223 is a wasteful number, since it uses less digits than its factorization.

81461230223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518861496.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 81461230223 in words is "eighty-one billion, four hundred sixty-one million, two hundred thirty thousand, two hundred twenty-three".