166563620 has 48 divisors (see below), whose sum is σ = 382330368. Its totient is φ = 60679680.

The previous prime is 166563613. The next prime is 166563643. The reversal of 166563620 is 26365661.

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, 2639 + ... + 18441.

It is an arithmetic number, because the mean of its divisors is an integer number (7965216).

Almost surely, 2^166563620 is an apocalyptic number.

166563620 is a gapful number since it is divisible by the number (10) 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 166563620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191165184).

166563620 is an abundant number, since it is smaller than the sum of its proper divisors (215766748).

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

166563620 is a wasteful number, since it uses less digits than its factorization.

166563620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15860 (or 15858 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 166563620 is about 12905.9528900426. The cubic root of 166563620 is about 550.2077672343.

The spelling of 166563620 in words is "one hundred sixty-six million, five hundred sixty-three thousand, six hundred twenty".