85861511808 has 32 divisors (see below), whose sum is σ = 228069641760. Its totient is φ = 28620503808.

The previous prime is 85861511759. The next prime is 85861511831. The reversal of 85861511808 is 80811516858.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111798460 + ... + 111799227.

It is an arithmetic number, because the mean of its divisors is an integer number (7127176305).

Almost surely, 2^85861511808 is an apocalyptic number.

It is an amenable number.

85861511808 is an abundant number, since it is smaller than the sum of its proper divisors (142208129952).

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

85861511808 is a wasteful number, since it uses less digits than its factorization.

85861511808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223597704 (or 223597692 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 51.

The spelling of 85861511808 in words is "eighty-five billion, eight hundred sixty-one million, five hundred eleven thousand, eight hundred eight".