163990354208 has 54 divisors (see below), whose sum is σ = 343046152953. Its totient is φ = 77153605120.

The previous prime is 163990354201. The next prime is 163990354271. The reversal of 163990354208 is 802453099361.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 150088057744 + 13902296464 = 387412^2 + 117908^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=286348.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163990354201) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 38941223 + ... + 38945433.

Almost surely, 2^163990354208 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 163990354208

163990354208 is an abundant number, since it is smaller than the sum of its proper divisors (179055798745).

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

163990354208 is an frugal number, since it uses more digits than its factorization.

163990354208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8466 (or 4230 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 50.

Multiplying 163990354208 by its sum of digits (50), we get a square (8199517710400 = 2863480²).

The spelling of 163990354208 in words is "one hundred sixty-three billion, nine hundred ninety million, three hundred fifty-four thousand, two hundred eight".