166006620 has 144 divisors (see below), whose sum is σ = 551652192. Its totient is φ = 40158720.

The previous prime is 166006601. The next prime is 166006639. The reversal of 166006620 is 26600661.

It is an interprime number because it is at equal distance from previous prime (166006601) and next prime (166006639).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142159 + ... + 143321.

It is an arithmetic number, because the mean of its divisors is an integer number (3830918).

Almost surely, 2^166006620 is an apocalyptic number.

166006620 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 166006620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275826096).

166006620 is an abundant number, since it is smaller than the sum of its proper divisors (385645572).

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

166006620 is a wasteful number, since it uses less digits than its factorization.

166006620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 166006620 is about 12884.3556299879. The cubic root of 166006620 is about 549.5937716602.

It can be divided in two parts, 16600 and 6620, that added together give a triangular number (23220 = T₂₁₅).

The spelling of 166006620 in words is "one hundred sixty-six million, six thousand, six hundred twenty".