18415223520 has 192 divisors, whose sum is σ = 58734305280. Its totient is φ = 4849625088.

The previous prime is 18415223507. The next prime is 18415223537. The reversal of 18415223520 is 2532251481.

It is a super-2 number, since 2×18415223520² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16397679 + ... + 16398801.

It is an arithmetic number, because the mean of its divisors is an integer number (305907840).

Almost surely, 2^18415223520 is an apocalyptic number.

18415223520 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 18415223520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29367152640).

18415223520 is an abundant number, since it is smaller than the sum of its proper divisors (40319081760).

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

18415223520 is a wasteful number, since it uses less digits than its factorization.

18415223520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537 (or 1529 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The spelling of 18415223520 in words is "eighteen billion, four hundred fifteen million, two hundred twenty-three thousand, five hundred twenty".