163420445 has 6 divisors (see below), whose sum is σ = 196138842. Its totient is φ = 130713488.

The previous prime is 163420441. The next prime is 163420447. The reversal of 163420445 is 544024361.

It can be written as a sum of positive squares in 3 ways, for example, as 25381444 + 138039001 = 5038^2 + 11749^2 .

It is not a de Polignac number, because 163420445 - 2² = 163420441 is a prime.

It is a super-3 number, since 3×163420445³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163420441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25727 + ... + 31443.

It is an arithmetic number, because the mean of its divisors is an integer number (32689807).

Almost surely, 2^163420445 is an apocalyptic number.

It is an amenable number.

163420445 is a deficient number, since it is larger than the sum of its proper divisors (32718397).

163420445 is an frugal number, since it uses more digits than its factorization.

163420445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11439 (or 5722 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 163420445 is about 12783.6006273663. The cubic root of 163420445 is about 546.7248275336.

Multiplying 163420445 by its product of nonzero digits (11520), we get a square (1882603526400 = 1372080²).

The spelling of 163420445 in words is "one hundred sixty-three million, four hundred twenty thousand, four hundred forty-five".