85531717824 has 56 divisors (see below), whose sum is σ = 258631627008. Its totient is φ = 24437633280.

The previous prime is 85531717807. The next prime is 85531717853. The reversal of 85531717824 is 42871713558.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31818492 + ... + 31821179.

Almost surely, 2^85531717824 is an apocalyptic number.

85531717824 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

85531717824 is an abundant number, since it is smaller than the sum of its proper divisors (173099909184).

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

85531717824 is a wasteful number, since it uses less digits than its factorization.

85531717824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63639693 (or 63639683 counting only the distinct ones).

The product of its digits is 1881600, while the sum is 51.

The spelling of 85531717824 in words is "eighty-five billion, five hundred thirty-one million, seven hundred seventeen thousand, eight hundred twenty-four".