18863520816 has 160 divisors (see below), whose sum is σ = 56371392000. Its totient is φ = 5324175360.

The previous prime is 18863520803. The next prime is 18863520827. The reversal of 18863520816 is 61802536881.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 17981860 + ... + 17982908.

It is an arithmetic number, because the mean of its divisors is an integer number (352321200).

Almost surely, 2^18863520816 is an apocalyptic number.

18863520816 is a gapful number since it is divisible by the number (16) 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 18863520816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28185696000).

18863520816 is an abundant number, since it is smaller than the sum of its proper divisors (37507871184).

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

18863520816 is a wasteful number, since it uses less digits than its factorization.

18863520816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667 (or 1661 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 18863520816 in words is "eighteen billion, eight hundred sixty-three million, five hundred twenty thousand, eight hundred sixteen".