85517878785 has 16 divisors (see below), whose sum is σ = 137873102400. Its totient is φ = 45261369920.

The previous prime is 85517878757. The next prime is 85517878801. The reversal of 85517878785 is 58787871558.

It is not a de Polignac number, because 85517878785 - 2¹¹ = 85517876737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21758310 + ... + 21762239.

It is an arithmetic number, because the mean of its divisors is an integer number (8617068900).

Almost surely, 2^85517878785 is an apocalyptic number.

It is an amenable number.

85517878785 is a deficient number, since it is larger than the sum of its proper divisors (52355223615).

85517878785 is a wasteful number, since it uses less digits than its factorization.

85517878785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43520688.

The product of its digits is 175616000, while the sum is 69.

The spelling of 85517878785 in words is "eighty-five billion, five hundred seventeen million, eight hundred seventy-eight thousand, seven hundred eighty-five".