18318219580 has 24 divisors (see below), whose sum is σ = 40492907280. Its totient is φ = 6941640960.

The previous prime is 18318219571. The next prime is 18318219589. The reversal of 18318219580 is 8591281381.

It is an interprime number because it is at equal distance from previous prime (18318219571) and next prime (18318219589).

It is a self number, because there is not a number n which added to its sum of digits gives 18318219580.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18318219589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24102541 + ... + 24103300.

It is an arithmetic number, because the mean of its divisors is an integer number (1687204470).

Almost surely, 2^18318219580 is an apocalyptic number.

18318219580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18318219580 is an abundant number, since it is smaller than the sum of its proper divisors (22174687700).

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

18318219580 is a wasteful number, since it uses less digits than its factorization.

18318219580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48205869 (or 48205867 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 46.

The spelling of 18318219580 in words is "eighteen billion, three hundred eighteen million, two hundred nineteen thousand, five hundred eighty".