18064853820 has 768 divisors, whose sum is σ = 69905203200. Its totient is φ = 3822059520.

The previous prime is 18064853813. The next prime is 18064853843. The reversal of 18064853820 is 2835846081.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 70291132 + ... + 70291388.

It is an arithmetic number, because the mean of its divisors is an integer number (91022400).

Almost surely, 2^18064853820 is an apocalyptic number.

18064853820 is a gapful number since it is divisible by the number (10) 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 18064853820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34952601600).

18064853820 is an abundant number, since it is smaller than the sum of its proper divisors (51840349380).

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

18064853820 is a wasteful number, since it uses less digits than its factorization.

18064853820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 18064853820 in words is "eighteen billion, sixty-four million, eight hundred fifty-three thousand, eight hundred twenty".