2158820164 has 12 divisors (see below), whose sum is σ = 3778488000. Its totient is φ = 1079252168.

The previous prime is 2158820159. The next prime is 2158820177. The reversal of 2158820164 is 4610288512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5464 + ... + 65935.

It is an arithmetic number, because the mean of its divisors is an integer number (314874000).

Almost surely, 2^2158820164 is an apocalyptic number.

It is an amenable number.

2158820164 is a deficient number, since it is larger than the sum of its proper divisors (1619667836).

2158820164 is a wasteful number, since it uses less digits than its factorization.

2158820164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78962 (or 78960 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 2158820164 is about 46463.1054063329. The cubic root of 2158820164 is about 1292.4254119306.

The spelling of 2158820164 in words is "two billion, one hundred fifty-eight million, eight hundred twenty thousand, one hundred sixty-four".