166213620 has 240 divisors, whose sum is σ = 556174080. Its totient is φ = 41492736.

The previous prime is 166213601. The next prime is 166213637. The reversal of 166213620 is 26312661.

166213620 is a `hidden beast` number, since 1 + 6 + 621 + 36 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2817151 + ... + 2817209.

It is an arithmetic number, because the mean of its divisors is an integer number (2317392).

Almost surely, 2^166213620 is an apocalyptic number.

166213620 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 166213620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278087040).

166213620 is an abundant number, since it is smaller than the sum of its proper divisors (389960460).

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

166213620 is a wasteful number, since it uses less digits than its factorization.

166213620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 153 counting only the distinct ones).

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

The square root of 166213620 is about 12892.3861251515. The cubic root of 166213620 is about 549.8221132711.

The spelling of 166213620 in words is "one hundred sixty-six million, two hundred thirteen thousand, six hundred twenty".