18208349952 has 144 divisors (see below), whose sum is σ = 54935852160. Its totient is φ = 5307641856.

The previous prime is 18208349903. The next prime is 18208349981. The reversal of 18208349952 is 25994380281.

It is a junction number, because it is equal to n+sod(n) for n = 18208349895 and 18208349904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141703 + ... + 237689.

Almost surely, 2^18208349952 is an apocalyptic number.

18208349952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18208349952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27467926080).

18208349952 is an abundant number, since it is smaller than the sum of its proper divisors (36727502208).

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

18208349952 is a wasteful number, since it uses less digits than its factorization.

18208349952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96038 (or 96024 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 18208349952 in words is "eighteen billion, two hundred eight million, three hundred forty-nine thousand, nine hundred fifty-two".