166666684842 has 96 divisors (see below), whose sum is σ = 415497962880. Its totient is φ = 47296679040.

The previous prime is 166666684841. The next prime is 166666684853. The reversal of 166666684842 is 248486666661.

166666684842 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 (63).

It is a self number, because there is not a number n which added to its sum of digits gives 166666684842.

It is not an unprimeable number, because it can be changed into a prime (166666684841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21219388 + ... + 21227240.

It is an arithmetic number, because the mean of its divisors is an integer number (4328103780).

Almost surely, 2^166666684842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166666684842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207748981440).

166666684842 is an abundant number, since it is smaller than the sum of its proper divisors (248831278038).

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

166666684842 is a wasteful number, since it uses less digits than its factorization.

166666684842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8988 (or 8985 counting only the distinct ones).

The product of its digits is 95551488, while the sum is 63.

The spelling of 166666684842 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred eighty-four thousand, eight hundred forty-two".