2158291868 has 12 divisors (see below), whose sum is σ = 3777412800. Its totient is φ = 1079031072.

The previous prime is 2158291843. The next prime is 2158291873. The reversal of 2158291868 is 8681928512.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 24533 + ... + 70131.

It is an arithmetic number, because the mean of its divisors is an integer number (314784400).

Almost surely, 2^2158291868 is an apocalyptic number.

It is an amenable number.

2158291868 is a deficient number, since it is larger than the sum of its proper divisors (1619120932).

2158291868 is a wasteful number, since it uses less digits than its factorization.

2158291868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57436 (or 57434 counting only the distinct ones).

The product of its digits is 552960, while the sum is 50.

The square root of 2158291868 is about 46457.4199455803. The cubic root of 2158291868 is about 1292.3199779702.

The spelling of 2158291868 in words is "two billion, one hundred fifty-eight million, two hundred ninety-one thousand, eight hundred sixty-eight".