2166684042 has 16 divisors (see below), whose sum is σ = 4521775680. Its totient is φ = 690826752.

The previous prime is 2166684031. The next prime is 2166684059. The reversal of 2166684042 is 2404866612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7850167 + ... + 7850442.

It is an arithmetic number, because the mean of its divisors is an integer number (282610980).

Almost surely, 2^2166684042 is an apocalyptic number.

2166684042 is an abundant number, since it is smaller than the sum of its proper divisors (2355091638).

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

2166684042 is a wasteful number, since it uses less digits than its factorization.

2166684042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15700637.

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 2166684042 is about 46547.6534532086. The cubic root of 2166684042 is about 1293.9928050996.

The spelling of 2166684042 in words is "two billion, one hundred sixty-six million, six hundred eighty-four thousand, forty-two".