166636840 has 64 divisors (see below), whose sum is σ = 411868800. Its totient is φ = 60394752.

The previous prime is 166636831. The next prime is 166636843. The reversal of 166636840 is 48636661.

166636840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 166636793 and 166636802.

It is not an unprimeable number, because it can be changed into a prime (166636843) 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, 12714 + ... + 22246.

It is an arithmetic number, because the mean of its divisors is an integer number (6435450).

Almost surely, 2^166636840 is an apocalyptic number.

166636840 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 166636840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205934400).

166636840 is an abundant number, since it is smaller than the sum of its proper divisors (245231960).

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

166636840 is a wasteful number, since it uses less digits than its factorization.

166636840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9586 (or 9582 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 166636840 is about 12908.7892538379. The cubic root of 166636840 is about 550.2883776961.

The spelling of 166636840 in words is "one hundred sixty-six million, six hundred thirty-six thousand, eight hundred forty".