2158820166 has 64 divisors (see below), whose sum is σ = 4619704320. Its totient is φ = 670602240.

The previous prime is 2158820159. The next prime is 2158820177. The reversal of 2158820166 is 6610288512.

It is a congruent number.

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, 2177931 + ... + 2178921.

It is an arithmetic number, because the mean of its divisors is an integer number (72182880).

Almost surely, 2^2158820166 is an apocalyptic number.

2158820166 is an abundant number, since it is smaller than the sum of its proper divisors (2460884154).

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

2158820166 is a wasteful number, since it uses less digits than its factorization.

2158820166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 2158820166 is about 46463.1054278553. The cubic root of 2158820166 is about 1292.4254123297.

The spelling of 2158820166 in words is "two billion, one hundred fifty-eight million, eight hundred twenty thousand, one hundred sixty-six".