18046722281 has 4 divisors (see below), whose sum is σ = 20624825472. Its totient is φ = 15468619092.

The previous prime is 18046722263. The next prime is 18046722293. The reversal of 18046722281 is 18222764081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18222764081 = 229 ⋅79575389.

It is a cyclic number.

It is not a de Polignac number, because 18046722281 - 2⁶ = 18046722217 is a prime.

It is a super-2 number, since 2×18046722281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18046724281) 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, 1289051585 + ... + 1289051598.

It is an arithmetic number, because the mean of its divisors is an integer number (5156206368).

Almost surely, 2^18046722281 is an apocalyptic number.

It is an amenable number.

18046722281 is a deficient number, since it is larger than the sum of its proper divisors (2578103191).

18046722281 is an equidigital number, since it uses as much as digits as its factorization.

18046722281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2578103190.

The product of its (nonzero) digits is 86016, while the sum is 41.

The spelling of 18046722281 in words is "eighteen billion, forty-six million, seven hundred twenty-two thousand, two hundred eighty-one".