163903522500 has 135 divisors (see below), whose sum is σ = 517915769371. Its totient is φ = 43691412000.

The previous prime is 163903522481. The next prime is 163903522513. The reversal of 163903522500 is 5225309361.

The square root of 163903522500 is 404850.

It is a perfect power (a square), and thus also a powerful number.

163903522500 is a `hidden beast` number, since 1 + 63 + 90 + 3 + 5 + 2 + 2 + 500 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12850036164 + 151053486336 = 113358^2 + 388656^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 60726151 + ... + 60728849.

Almost surely, 2^163903522500 is an apocalyptic number.

163903522500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163903522500 is the 404850-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163903522500

163903522500 is an abundant number, since it is smaller than the sum of its proper divisors (354012246871).

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

163903522500 is an frugal number, since it uses more digits than its factorization.

163903522500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5428 (or 2709 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

Multiplying 163903522500 by its sum of digits (36), we get a square (5900526810000 = 2429100²).

163903522500 divided by its sum of digits (36) gives a square (4552875625 = 67475²).

The spelling of 163903522500 in words is "one hundred sixty-three billion, nine hundred three million, five hundred twenty-two thousand, five hundred".