166603444 has 48 divisors (see below), whose sum is σ = 353477376. Its totient is φ = 67161600.

The previous prime is 166603429. The next prime is 166603453. The reversal of 166603444 is 444306661.

It is a super-2 number, since 2×166603444² = 55513415105322272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37164 + ... + 41404.

It is an arithmetic number, because the mean of its divisors is an integer number (7364112).

Almost surely, 2^166603444 is an apocalyptic number.

166603444 is a gapful number since it is divisible by the number (14) 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 166603444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176738688).

166603444 is an abundant number, since it is smaller than the sum of its proper divisors (186873932).

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

166603444 is a wasteful number, since it uses less digits than its factorization.

166603444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4336 (or 4334 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 166603444 is about 12907.4956517521. The cubic root of 166603444 is about 550.2516137999.

The spelling of 166603444 in words is "one hundred sixty-six million, six hundred three thousand, four hundred forty-four".