168194644 has 12 divisors (see below), whose sum is σ = 294489664. Its totient is φ = 84054744.

The previous prime is 168194633. The next prime is 168194657. The reversal of 168194644 is 446491861.

It is a self number, because there is not a number n which added to its sum of digits gives 168194644.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 732 + ... + 18355.

Almost surely, 2^168194644 is an apocalyptic number.

It is an amenable number.

168194644 is a deficient number, since it is larger than the sum of its proper divisors (126295020).

168194644 is a wasteful number, since it uses less digits than its factorization.

168194644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21294 (or 21292 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 168194644 is about 12968.9877785431. The cubic root of 168194644 is about 551.9978514584.

The spelling of 168194644 in words is "one hundred sixty-eight million, one hundred ninety-four thousand, six hundred forty-four".