166642646 has 8 divisors (see below), whose sum is σ = 250867200. Its totient is φ = 83020248.

The previous prime is 166642633. The next prime is 166642649. The reversal of 166642646 is 646246661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166642649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149846 + ... + 150953.

It is an arithmetic number, because the mean of its divisors is an integer number (31358400).

Almost surely, 2^166642646 is an apocalyptic number.

166642646 is a deficient number, since it is larger than the sum of its proper divisors (84224554).

166642646 is a wasteful number, since it uses less digits than its factorization.

166642646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301078.

The product of its digits is 248832, while the sum is 41.

The square root of 166642646 is about 12909.0141374158. The cubic root of 166642646 is about 550.2947687143.

The spelling of 166642646 in words is "one hundred sixty-six million, six hundred forty-two thousand, six hundred forty-six".