1805085870847 has 4 divisors (see below), whose sum is σ = 2062955280976. Its totient is φ = 1547216460720.

The previous prime is 1805085870811. The next prime is 1805085870853. The reversal of 1805085870847 is 7480785805081.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1805085870847 is a prime.

It is a super-2 number, since 2×1805085870847² (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 (1805085870047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128934705054 + ... + 128934705067.

It is an arithmetic number, because the mean of its divisors is an integer number (515738820244).

Almost surely, 2^{1805085870847} is an apocalyptic number.

1805085870847 is a deficient number, since it is larger than the sum of its proper divisors (257869410129).

1805085870847 is an equidigital number, since it uses as much as digits as its factorization.

1805085870847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257869410128.

The product of its (nonzero) digits is 20070400, while the sum is 61.

The spelling of 1805085870847 in words is "one trillion, eight hundred five billion, eighty-five million, eight hundred seventy thousand, eight hundred forty-seven".