166661000 has 128 divisors (see below), whose sum is σ = 432432000. Its totient is φ = 59616000.

The previous prime is 166660969. The next prime is 166661029. The reversal of 166661000 is 166661.

166661000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1198931 + ... + 1199069.

It is an arithmetic number, because the mean of its divisors is an integer number (3378375).

Almost surely, 2^166661000 is an apocalyptic number.

166661000 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 166661000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216216000).

166661000 is an abundant number, since it is smaller than the sum of its proper divisors (265771000).

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

166661000 is a wasteful number, since it uses less digits than its factorization.

166661000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 166661000 is about 12909.7250164363. The cubic root of 166661000 is about 550.3149711047.

166661000 divided by its reverse (166661) gives a cube (1000 = 10³).

It can be divided in two parts, 166 and 661000, that added together give a palindrome (661166).

The spelling of 166661000 in words is "one hundred sixty-six million, six hundred sixty-one thousand".