18208416906 has 24 divisors (see below), whose sum is σ = 39894849540. Its totient is φ = 6001275456.

The previous prime is 18208416887. The next prime is 18208416991. The reversal of 18208416906 is 60961480281.

It can be written as a sum of positive squares in 2 ways, for example, as 14728006881 + 3480410025 = 121359^2 + 58995^2 .

It is a super-2 number, since 2×18208416906² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5681425 + ... + 5684628.

Almost surely, 2^18208416906 is an apocalyptic number.

18208416906 is an abundant number, since it is smaller than the sum of its proper divisors (21686432634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18208416906 is a wasteful number, since it uses less digits than its factorization.

18208416906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11366150 (or 11366147 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 18208416906 in words is "eighteen billion, two hundred eight million, four hundred sixteen thousand, nine hundred six".