166642650 has 48 divisors (see below), whose sum is σ = 459196800. Its totient is φ = 44437680.

The previous prime is 166642649. The next prime is 166642657. The reversal of 166642650 is 56246661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (166642657) 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 23 ways as a sum of consecutive naturals, for example, 60370 + ... + 63069.

It is an arithmetic number, because the mean of its divisors is an integer number (9566600).

Almost surely, 2^166642650 is an apocalyptic number.

166642650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166642650 is an abundant number, since it is smaller than the sum of its proper divisors (292554150).

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

166642650 is a wasteful number, since it uses less digits than its factorization.

166642650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123460 (or 123449 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 166642650 is about 12909.0142923463. The cubic root of 166642650 is about 550.2947731173.

The spelling of 166642650 in words is "one hundred sixty-six million, six hundred forty-two thousand, six hundred fifty".