18510080221 has 8 divisors (see below), whose sum is σ = 18696123864. Its totient is φ = 18324091200.

The previous prime is 18510080219. The next prime is 18510080249. The reversal of 18510080221 is 12208001581.

It can be written as a sum of positive squares in 4 ways, for example, as 5056632100 + 13453448121 = 71110^2 + 115989^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18510080221 - 2¹ = 18510080219 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 18510080221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18510080261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230075 + ... + 1245031.

It is an arithmetic number, because the mean of its divisors is an integer number (2337015483).

Almost surely, 2^18510080221 is an apocalyptic number.

It is an amenable number.

18510080221 is a deficient number, since it is larger than the sum of its proper divisors (186043643).

18510080221 is a wasteful number, since it uses less digits than its factorization.

18510080221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27311.

The product of its (nonzero) digits is 1280, while the sum is 28.

The spelling of 18510080221 in words is "eighteen billion, five hundred ten million, eighty thousand, two hundred twenty-one".