85641808869 has 16 divisors (see below), whose sum is σ = 127083755200. Its totient is φ = 57001388688.

The previous prime is 85641808829. The next prime is 85641808873. The reversal of 85641808869 is 96880814658.

85641808869 is a `hidden beast` number, since 8 + 564 + 1 + 8 + 0 + 8 + 8 + 69 = 666.

It is not a de Polignac number, because 85641808869 - 2²⁸ = 85373373413 is a prime.

It is a super-2 number, since 2×85641808869² (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 (85641808829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2570659 + ... + 2603760.

It is an arithmetic number, because the mean of its divisors is an integer number (7942734700).

Almost surely, 2^85641808869 is an apocalyptic number.

It is an amenable number.

85641808869 is a deficient number, since it is larger than the sum of its proper divisors (41441946331).

85641808869 is a wasteful number, since it uses less digits than its factorization.

85641808869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5175041 (or 5175035 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 63.

The spelling of 85641808869 in words is "eighty-five billion, six hundred forty-one million, eight hundred eight thousand, eight hundred sixty-nine".