85817555 has 4 divisors (see below), whose sum is σ = 102981072. Its totient is φ = 68654040.

The previous prime is 85817533. The next prime is 85817561. The reversal of 85817555 is 55571858.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 85817555 - 2¹⁴ = 85801171 is a prime.

It is a Duffinian number.

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, 8581751 + ... + 8581760.

It is an arithmetic number, because the mean of its divisors is an integer number (25745268).

Almost surely, 2^85817555 is an apocalyptic number.

85817555 is a deficient number, since it is larger than the sum of its proper divisors (17163517).

85817555 is a wasteful number, since it uses less digits than its factorization.

85817555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17163516.

The product of its digits is 280000, while the sum is 44.

The square root of 85817555 is about 9263.7764977357. The cubic root of 85817555 is about 441.0881383816.

The spelling of 85817555 in words is "eighty-five million, eight hundred seventeen thousand, five hundred fifty-five".