18166602240 has 960 divisors, whose sum is σ = 72389116800. Its totient is φ = 4347592704.

The previous prime is 18166602217. The next prime is 18166602247. The reversal of 18166602240 is 4220666181.

It is a tau number, because it is divible by the number of its divisors (960).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18166602195 and 18166602204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18166602247) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 342766054 + ... + 342766106.

It is an arithmetic number, because the mean of its divisors is an integer number (75405330).

Almost surely, 2^18166602240 is an apocalyptic number.

18166602240 is a gapful number since it is divisible by the number (10) 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 18166602240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36194558400).

18166602240 is an abundant number, since it is smaller than the sum of its proper divisors (54222514560).

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

18166602240 is an equidigital number, since it uses as much as digits as its factorization.

18166602240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 18166602240 in words is "eighteen billion, one hundred sixty-six million, six hundred two thousand, two hundred forty".