18608049221 has 4 divisors (see below), whose sum is σ = 18675226572. Its totient is φ = 18540871872.

The previous prime is 18608049203. The next prime is 18608049263. The reversal of 18608049221 is 12294080681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12294080681 = 23 ⋅534525247.

It can be written as a sum of positive squares in 2 ways, for example, as 11154316996 + 7453732225 = 105614^2 + 86335^2 .

It is a cyclic number.

It is not a de Polignac number, because 18608049221 - 2⁶ = 18608049157 is a prime.

It is a super-2 number, since 2×18608049221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18608049281) 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, 33588260 + ... + 33588813.

It is an arithmetic number, because the mean of its divisors is an integer number (4668806643).

Almost surely, 2^18608049221 is an apocalyptic number.

It is an amenable number.

18608049221 is a deficient number, since it is larger than the sum of its proper divisors (67177351).

18608049221 is an equidigital number, since it uses as much as digits as its factorization.

18608049221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67177350.

The product of its (nonzero) digits is 55296, while the sum is 41.

The spelling of 18608049221 in words is "eighteen billion, six hundred eight million, forty-nine thousand, two hundred twenty-one".