18021679872 has 288 divisors, whose sum is σ = 59922100224. Its totient is φ = 4689100800.

The previous prime is 18021679849. The next prime is 18021679913. The reversal of 18021679872 is 27897612081.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2829972 + ... + 2836332.

It is an arithmetic number, because the mean of its divisors is an integer number (208062848).

Almost surely, 2^18021679872 is an apocalyptic number.

18021679872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18021679872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29961050112).

18021679872 is an abundant number, since it is smaller than the sum of its proper divisors (41900420352).

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

18021679872 is a wasteful number, since it uses less digits than its factorization.

18021679872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435 (or 6421 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 51.

The spelling of 18021679872 in words is "eighteen billion, twenty-one million, six hundred seventy-nine thousand, eight hundred seventy-two".