2158185806 has 8 divisors (see below), whose sum is σ = 3699747120. Its totient is φ = 924936768.

The previous prime is 2158185787. The next prime is 2158185817. The reversal of 2158185806 is 6085818512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 77078051 + ... + 77078078.

It is an arithmetic number, because the mean of its divisors is an integer number (462468390).

Almost surely, 2^2158185806 is an apocalyptic number.

2158185806 is a deficient number, since it is larger than the sum of its proper divisors (1541561314).

2158185806 is a wasteful number, since it uses less digits than its factorization.

2158185806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154156138.

The product of its (nonzero) digits is 153600, while the sum is 44.

The square root of 2158185806 is about 46456.2784346745. The cubic root of 2158185806 is about 1292.2988087162.

The spelling of 2158185806 in words is "two billion, one hundred fifty-eight million, one hundred eighty-five thousand, eight hundred six".