18208313312 has 72 divisors (see below), whose sum is σ = 42106602384. Its totient is φ = 7592527872.

The previous prime is 18208313273. The next prime is 18208313351. The reversal of 18208313312 is 21331380281.

It is an interprime number because it is at equal distance from previous prime (18208313273) and next prime (18208313351).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent 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, 276968 + ... + 336344.

It is an arithmetic number, because the mean of its divisors is an integer number (584813922).

Almost surely, 2^18208313312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18208313312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21053301192).

18208313312 is an abundant number, since it is smaller than the sum of its proper divisors (23898289072).

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

18208313312 is an equidigital number, since it uses as much as digits as its factorization.

18208313312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59468 (or 59423 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

Adding to 18208313312 its reverse (21331380281), we get a palindrome (39539693593).

The spelling of 18208313312 in words is "eighteen billion, two hundred eight million, three hundred thirteen thousand, three hundred twelve".