18220664245 has 64 divisors (see below), whose sum is σ = 26379505152. Its totient is φ = 11819520000.

The previous prime is 18220664237. The next prime is 18220664257. The reversal of 18220664245 is 54246602281.

It is not a de Polignac number, because 18220664245 - 2³ = 18220664237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18220664198 and 18220664207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30316945 + ... + 30317545.

It is an arithmetic number, because the mean of its divisors is an integer number (412179768).

Almost surely, 2^18220664245 is an apocalyptic number.

It is an amenable number.

18220664245 is a deficient number, since it is larger than the sum of its proper divisors (8158840907).

18220664245 is a wasteful number, since it uses less digits than its factorization.

18220664245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262.

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 18220664245 in words is "eighteen billion, two hundred twenty million, six hundred sixty-four thousand, two hundred forty-five".