2185856670 has 32 divisors (see below), whose sum is σ = 5247664128. Its totient is φ = 582716448.

The previous prime is 2185856641. The next prime is 2185856677. The reversal of 2185856670 is 766585812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185856677) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 109827 + ... + 128193.

It is an arithmetic number, because the mean of its divisors is an integer number (163989504).

Almost surely, 2^2185856670 is an apocalyptic number.

2185856670 is an abundant number, since it is smaller than the sum of its proper divisors (3061807458).

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

2185856670 is a wasteful number, since it uses less digits than its factorization.

2185856670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22344.

The product of its (nonzero) digits is 806400, while the sum is 48.

The square root of 2185856670 is about 46753.1460973484. The cubic root of 2185856670 is about 1297.7983780728.

The spelling of 2185856670 in words is "two billion, one hundred eighty-five million, eight hundred fifty-six thousand, six hundred seventy".