1085810818681 has 8 divisors (see below), whose sum is σ = 1087635848904. Its totient is φ = 1083986442240.

The previous prime is 1085810818669. The next prime is 1085810818709. The reversal of 1085810818681 is 1868180185801.

It can be written as a sum of positive squares in 4 ways, for example, as 103053840400 + 982756978281 = 321020^2 + 991341^2 .

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 1085810818681 - 2⁵ = 1085810818649 is a prime.

It is a super-2 number, since 2×1085810818681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1085810818661) 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, 3219651 + ... + 3540871.

It is an arithmetic number, because the mean of its divisors is an integer number (135954481113).

Almost surely, 2^{1085810818681} is an apocalyptic number.

It is an amenable number.

1085810818681 is a deficient number, since it is larger than the sum of its proper divisors (1825030223).

1085810818681 is an equidigital number, since it uses as much as digits as its factorization.

1085810818681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326891.

The product of its (nonzero) digits is 983040, while the sum is 55.

The spelling of 1085810818681 in words is "one trillion, eighty-five billion, eight hundred ten million, eight hundred eighteen thousand, six hundred eighty-one".