85809665878 has 16 divisors (see below), whose sum is σ = 132882748416. Its totient is φ = 41515753320.

The previous prime is 85809665867. The next prime is 85809665881. The reversal of 85809665878 is 87856690858.

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, 457225 + ... + 616987.

It is an arithmetic number, because the mean of its divisors is an integer number (8305171776).

Almost surely, 2^85809665878 is an apocalyptic number.

85809665878 is a deficient number, since it is larger than the sum of its proper divisors (47073082538).

85809665878 is a wasteful number, since it uses less digits than its factorization.

85809665878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168459.

The product of its (nonzero) digits is 232243200, while the sum is 70.

The spelling of 85809665878 in words is "eighty-five billion, eight hundred nine million, six hundred sixty-five thousand, eight hundred seventy-eight".