18099722320 has 40 divisors (see below), whose sum is σ = 42142883040. Its totient is φ = 7229389440.

The previous prime is 18099722287. The next prime is 18099722351. The reversal of 18099722320 is 2322799081.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×18099722320² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 108430 + ... + 218989.

It is an arithmetic number, because the mean of its divisors is an integer number (1053572076).

Almost surely, 2^18099722320 is an apocalyptic number.

18099722320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18099722320 is an abundant number, since it is smaller than the sum of its proper divisors (24043160720).

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

18099722320 is a wasteful number, since it uses less digits than its factorization.

18099722320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328123 (or 328117 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 18099722320 in words is "eighteen billion, ninety-nine million, seven hundred twenty-two thousand, three hundred twenty".