2185505800871 has 8 divisors (see below), whose sum is σ = 2227038786864. Its totient is φ = 2143983816000.

The previous prime is 2185505800867. The next prime is 2185505800897. The reversal of 2185505800871 is 1780085055812.

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

It is a cyclic number.

It is not a de Polignac number, because 2185505800871 - 2² = 2185505800867 is a prime.

It is a super-2 number, since 2×2185505800871² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185505802871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2348630 + ... + 3144371.

It is an arithmetic number, because the mean of its divisors is an integer number (278379848358).

Almost surely, 2^{2185505800871} is an apocalyptic number.

2185505800871 is a deficient number, since it is larger than the sum of its proper divisors (41532985993).

2185505800871 is an equidigital number, since it uses as much as digits as its factorization.

2185505800871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5500561.

The product of its (nonzero) digits is 896000, while the sum is 50.

The spelling of 2185505800871 in words is "two trillion, one hundred eighty-five billion, five hundred five million, eight hundred thousand, eight hundred seventy-one".