18269397520 has 80 divisors (see below), whose sum is σ = 47097610560. Its totient is φ = 6534489600.

The previous prime is 18269397499. The next prime is 18269397533. The reversal of 18269397520 is 2579396281.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 116490 + ... + 223849.

It is an arithmetic number, because the mean of its divisors is an integer number (588720132).

Almost surely, 2^18269397520 is an apocalyptic number.

18269397520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18269397520 is an abundant number, since it is smaller than the sum of its proper divisors (28828213040).

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

18269397520 is a wasteful number, since it uses less digits than its factorization.

18269397520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340424 (or 340418 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 18269397520 in words is "eighteen billion, two hundred sixty-nine million, three hundred ninety-seven thousand, five hundred twenty".