18266411520 has 640 divisors, whose sum is σ = 78095001600. Its totient is φ = 3953442816.

The previous prime is 18266411483. The next prime is 18266411533. The reversal of 18266411520 is 2511466281.

It is a happy number.

18266411520 is a `hidden beast` number, since 1 + 8 + 2 + 6 + 641 + 1 + 5 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9191967 + ... + 9193953.

It is an arithmetic number, because the mean of its divisors is an integer number (122023440).

Almost surely, 2^18266411520 is an apocalyptic number.

18266411520 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 18266411520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39047500800).

18266411520 is an abundant number, since it is smaller than the sum of its proper divisors (59828590080).

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

18266411520 is a wasteful number, since it uses less digits than its factorization.

18266411520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045 (or 2023 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 18266411520 in words is "eighteen billion, two hundred sixty-six million, four hundred eleven thousand, five hundred twenty".