18218713820 has 12 divisors (see below), whose sum is σ = 38259299064. Its totient is φ = 7287485520.

The previous prime is 18218713811. The next prime is 18218713829. The reversal of 18218713820 is 2831781281.

It is an interprime number because it is at equal distance from previous prime (18218713811) and next prime (18218713829).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218713829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455467826 + ... + 455467865.

It is an arithmetic number, because the mean of its divisors is an integer number (3188274922).

Almost surely, 2^18218713820 is an apocalyptic number.

18218713820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18218713820 is an abundant number, since it is smaller than the sum of its proper divisors (20040585244).

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

18218713820 is a wasteful number, since it uses less digits than its factorization.

18218713820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910935700 (or 910935698 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 41.

The spelling of 18218713820 in words is "eighteen billion, two hundred eighteen million, seven hundred thirteen thousand, eight hundred twenty".