18943650320 has 80 divisors (see below), whose sum is σ = 50356300800. Its totient is φ = 6492344832.

The previous prime is 18943650317. The next prime is 18943650329. The reversal of 18943650320 is 2305634981.

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

It is a super-2 number, since 2×18943650320² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18943650329) by changing a digit.

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, 1816481 + ... + 1826879.

It is an arithmetic number, because the mean of its divisors is an integer number (629453760).

Almost surely, 2^18943650320 is an apocalyptic number.

18943650320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18943650320 is an abundant number, since it is smaller than the sum of its proper divisors (31412650480).

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

18943650320 is a wasteful number, since it uses less digits than its factorization.

18943650320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13672 (or 13666 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 18943650320 in words is "eighteen billion, nine hundred forty-three million, six hundred fifty thousand, three hundred twenty".