85291689581 has 8 divisors (see below), whose sum is σ = 97479934464. Its totient is φ = 73104374160.

The previous prime is 85291689577. The next prime is 85291689619. The reversal of 85291689581 is 18598619258.

It is a happy number.

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 85291689581 - 2² = 85291689577 is a prime.

It is a super-2 number, since 2×85291689581² (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 (85291689181) 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, 23165 + ... + 413666.

It is an arithmetic number, because the mean of its divisors is an integer number (12184991808).

Almost surely, 2^85291689581 is an apocalyptic number.

It is an amenable number.

85291689581 is a deficient number, since it is larger than the sum of its proper divisors (12188244883).

85291689581 is a wasteful number, since it uses less digits than its factorization.

85291689581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464731.

The product of its digits is 12441600, while the sum is 62.

The spelling of 85291689581 in words is "eighty-five billion, two hundred ninety-one million, six hundred eighty-nine thousand, five hundred eighty-one".