2185807454859 has 32 divisors (see below), whose sum is σ = 3475755740160. Its totient is φ = 1194663076992.

The previous prime is 2185807454851. The next prime is 2185807454867. The reversal of 2185807454859 is 9584547085812.

It is an interprime number because it is at equal distance from previous prime (2185807454851) and next prime (2185807454867).

It is not a de Polignac number, because 2185807454859 - 2³ = 2185807454851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2185807454859.

It is not an unprimeable number, because it can be changed into a prime (2185807454851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9736909 + ... + 9958865.

It is an arithmetic number, because the mean of its divisors is an integer number (108617366880).

Almost surely, 2^{2185807454859} is an apocalyptic number.

2185807454859 is a deficient number, since it is larger than the sum of its proper divisors (1289948285301).

2185807454859 is a wasteful number, since it uses less digits than its factorization.

2185807454859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242379.

The product of its (nonzero) digits is 129024000, while the sum is 66.

The spelling of 2185807454859 in words is "two trillion, one hundred eighty-five billion, eight hundred seven million, four hundred fifty-four thousand, eight hundred fifty-nine".