18609345720 has 192 divisors, whose sum is σ = 69195409920. Its totient is φ = 4248951552.

The previous prime is 18609345673. The next prime is 18609345739. The reversal of 18609345720 is 2754390681.

18609345720 is a `hidden beast` number, since 1 + 8 + 609 + 34 + 5 + 7 + 2 + 0 = 666.

It is a super-3 number, since 3×18609345720³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2675287 + ... + 2682233.

It is an arithmetic number, because the mean of its divisors is an integer number (360392760).

It is a 1-persistent number, because it is pandigital, but 2⋅18609345720 = 37218691440 is not.

Almost surely, 2^18609345720 is an apocalyptic number.

18609345720 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 18609345720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34597704960).

18609345720 is an abundant number, since it is smaller than the sum of its proper divisors (50586064200).

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

18609345720 is a wasteful number, since it uses less digits than its factorization.

18609345720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8034 (or 8027 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 18609345720 in words is "eighteen billion, six hundred nine million, three hundred forty-five thousand, seven hundred twenty".