2158161810 has 32 divisors (see below), whose sum is σ = 5919530112. Its totient is φ = 493294080.

The previous prime is 2158161799. The next prime is 2158161823. The reversal of 2158161810 is 181618512.

It is a super-2 number, since 2×2158161810² = 9315324796284952200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5138271 + ... + 5138690.

It is an arithmetic number, because the mean of its divisors is an integer number (184985316).

Almost surely, 2^2158161810 is an apocalyptic number.

2158161810 is an abundant number, since it is smaller than the sum of its proper divisors (3761368302).

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

2158161810 is a wasteful number, since it uses less digits than its factorization.

2158161810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10276978.

The product of its (nonzero) digits is 3840, while the sum is 33.

The square root of 2158161810 is about 46456.0201696185. The cubic root of 2158161810 is about 1292.2940191815.

The spelling of 2158161810 in words is "two billion, one hundred fifty-eight million, one hundred sixty-one thousand, eight hundred ten".