18347812226520 has 192 divisors, whose sum is σ = 64056444403680. Its totient is φ = 4192061497344.

The previous prime is 18347812226507. The next prime is 18347812226551. The reversal of 18347812226520 is 2562221874381.

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, 13689352 + ... + 14969768.

Almost surely, 2^{18347812226520} is an apocalyptic number.

18347812226520 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 18347812226520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32028222201840).

18347812226520 is an abundant number, since it is smaller than the sum of its proper divisors (45708632177160).

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

18347812226520 is a wasteful number, since it uses less digits than its factorization.

18347812226520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282882 (or 1282871 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 51.

The spelling of 18347812226520 in words is "eighteen trillion, three hundred forty-seven billion, eight hundred twelve million, two hundred twenty-six thousand, five hundred twenty".