166590 has 32 divisors (see below), whose sum is σ = 444960. Its totient is φ = 44352.

The previous prime is 166571. The next prime is 166597. The reversal of 166590 is 95661.

166590 is a `hidden beast` number, since 1 + 6 + 659 + 0 = 666.

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

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39 + ... + 578.

It is an arithmetic number, because the mean of its divisors is an integer number (13905).

2¹⁶⁶⁵⁹⁰ is an apocalyptic number.

166590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222480).

166590 is an abundant number, since it is smaller than the sum of its proper divisors (278370).

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

166590 is a wasteful number, since it uses less digits than its factorization.

166590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 166590 is about 408.1543825564. The cubic root of 166590 is about 55.0236812622.

The spelling of 166590 in words is "one hundred sixty-six thousand, five hundred ninety".