18172605312 has 160 divisors (see below), whose sum is σ = 54311464680. Its totient is φ = 6056695296.

The previous prime is 18172605259. The next prime is 18172605313. The reversal of 18172605312 is 21350627181.

18172605312 is a `hidden beast` number, since 1 + 8 + 17 + 2 + 605 + 31 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18172605313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2515818 + ... + 2523030.

Almost surely, 2^18172605312 is an apocalyptic number.

18172605312 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 18172605312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27155732340).

18172605312 is an abundant number, since it is smaller than the sum of its proper divisors (36138859368).

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

18172605312 is an frugal number, since it uses more digits than its factorization.

18172605312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7254 (or 7218 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 18172605312 in words is "eighteen billion, one hundred seventy-two million, six hundred five thousand, three hundred twelve".