85471816406172 has 24 divisors (see below), whose sum is σ = 227924843750016. Its totient is φ = 24420518973168.

The previous prime is 85471816406159. The next prime is 85471816406201. The reversal of 85471816406172 is 27160461817458.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 508760811858 + ... + 508760812025.

It is an arithmetic number, because the mean of its divisors is an integer number (9496868489584).

Almost surely, 2^{85471816406172} is an apocalyptic number.

It is an amenable number.

85471816406172 is an abundant number, since it is smaller than the sum of its proper divisors (142453027343844).

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

85471816406172 is a wasteful number, since it uses less digits than its factorization.

85471816406172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017521623897 (or 1017521623895 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 60.

The spelling of 85471816406172 in words is "eighty-five trillion, four hundred seventy-one billion, eight hundred sixteen million, four hundred six thousand, one hundred seventy-two".