85640808906 has 48 divisors (see below), whose sum is σ = 190186214400. Its totient is φ = 27842076864.

The previous prime is 85640808887. The next prime is 85640808941. The reversal of 85640808906 is 60980804658.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182611 + ... + 452358.

It is an arithmetic number, because the mean of its divisors is an integer number (3962212800).

Almost surely, 2^85640808906 is an apocalyptic number.

85640808906 is an abundant number, since it is smaller than the sum of its proper divisors (104545405494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85640808906 is a wasteful number, since it uses less digits than its factorization.

85640808906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635163 (or 635160 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 85640808906 in words is "eighty-five billion, six hundred forty million, eight hundred eight thousand, nine hundred six".