163720112500 has 144 divisors (see below), whose sum is σ = 411599905920. Its totient is φ = 55813680000.

The previous prime is 163720112497. The next prime is 163720112519. The reversal of 163720112500 is 5211027361.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15657274 + ... + 15667726.

It is an arithmetic number, because the mean of its divisors is an integer number (2858332680).

Almost surely, 2^163720112500 is an apocalyptic number.

163720112500 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 163720112500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205799952960).

163720112500 is an abundant number, since it is smaller than the sum of its proper divisors (247879793420).

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

163720112500 is a wasteful number, since it uses less digits than its factorization.

163720112500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10668 (or 10646 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

Adding to 163720112500 its reverse (5211027361), we get a palindrome (168931139861).

The spelling of 163720112500 in words is "one hundred sixty-three billion, seven hundred twenty million, one hundred twelve thousand, five hundred".