18235721730 has 16 divisors (see below), whose sum is σ = 43765732224. Its totient is φ = 4862859120.

The previous prime is 18235721729. The next prime is 18235721743. The reversal of 18235721730 is 3712753281.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303928666 + ... + 303928725.

It is an arithmetic number, because the mean of its divisors is an integer number (2735358264).

Almost surely, 2^18235721730 is an apocalyptic number.

18235721730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18235721730 is an abundant number, since it is smaller than the sum of its proper divisors (25530010494).

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

18235721730 is a wasteful number, since it uses less digits than its factorization.

18235721730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607857401.

The product of its (nonzero) digits is 70560, while the sum is 39.

The spelling of 18235721730 in words is "eighteen billion, two hundred thirty-five million, seven hundred twenty-one thousand, seven hundred thirty".