85481311681 has 8 divisors (see below), whose sum is σ = 87615408384. Its totient is φ = 83349557280.

The previous prime is 85481311649. The next prime is 85481311693. The reversal of 85481311681 is 18611318458.

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 85481311681 - 2⁵ = 85481311649 is a prime.

It is a super-2 number, since 2×85481311681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85481311631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511561 + ... + 657766.

It is an arithmetic number, because the mean of its divisors is an integer number (10951926048).

Almost surely, 2^85481311681 is an apocalyptic number.

It is an amenable number.

85481311681 is a deficient number, since it is larger than the sum of its proper divisors (2134096703).

85481311681 is a wasteful number, since it uses less digits than its factorization.

85481311681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171151.

The product of its digits is 184320, while the sum is 46.

The spelling of 85481311681 in words is "eighty-five billion, four hundred eighty-one million, three hundred eleven thousand, six hundred eighty-one".