18039963648 has 304 divisors, whose sum is σ = 57377969280. Its totient is φ = 4932501504.

The previous prime is 18039963553. The next prime is 18039963659. The reversal of 18039963648 is 84636993081.

It is a happy number.

It is a super-2 number, since 2×18039963648² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159645640 + ... + 159645752.

It is an arithmetic number, because the mean of its divisors is an integer number (188743320).

Almost surely, 2^18039963648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18039963648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28688984640).

18039963648 is an abundant number, since it is smaller than the sum of its proper divisors (39338005632).

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

18039963648 is an frugal number, since it uses more digits than its factorization.

18039963648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 57.

The spelling of 18039963648 in words is "eighteen billion, thirty-nine million, nine hundred sixty-three thousand, six hundred forty-eight".