85679861981 has 8 divisors (see below), whose sum is σ = 97938603264. Its totient is φ = 73425810960.

The previous prime is 85679861963. The next prime is 85679861983. The reversal of 85679861981 is 18916897658.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85679861981 is a prime.

It is a super-2 number, since 2×85679861981² (a number of 23 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 (85679861983) 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 7 ways as a sum of consecutive naturals, for example, 1133330 + ... + 1206563.

It is an arithmetic number, because the mean of its divisors is an integer number (12242325408).

Almost surely, 2^85679861981 is an apocalyptic number.

It is an amenable number.

85679861981 is a deficient number, since it is larger than the sum of its proper divisors (12258741283).

85679861981 is a wasteful number, since it uses less digits than its factorization.

85679861981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345131.

The product of its digits is 52254720, while the sum is 68.

The spelling of 85679861981 in words is "eighty-five billion, six hundred seventy-nine million, eight hundred sixty-one thousand, nine hundred eighty-one".