18172267336640 has 224 divisors, whose sum is σ = 45247652049600. Its totient is φ = 6942771118080.

The previous prime is 18172267336637. The next prime is 18172267336651. The reversal of 18172267336640 is 4663376227181.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 648370307 + ... + 648398333.

It is an arithmetic number, because the mean of its divisors is an integer number (201998446650).

Almost surely, 2^{18172267336640} is an apocalyptic number.

18172267336640 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 18172267336640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22623826024800).

18172267336640 is an abundant number, since it is smaller than the sum of its proper divisors (27075384712960).

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

18172267336640 is a wasteful number, since it uses less digits than its factorization.

18172267336640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28823 (or 28813 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 56.

The spelling of 18172267336640 in words is "eighteen trillion, one hundred seventy-two billion, two hundred sixty-seven million, three hundred thirty-six thousand, six hundred forty".