85105555 has 4 divisors (see below), whose sum is σ = 102126672. Its totient is φ = 68084440.

The previous prime is 85105549. The next prime is 85105577. The reversal of 85105555 is 55550158.

It is a happy number.

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

It is not a de Polignac number, because 85105555 - 2⁵ = 85105523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85105555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8510551 + ... + 8510560.

It is an arithmetic number, because the mean of its divisors is an integer number (25531668).

Almost surely, 2^85105555 is an apocalyptic number.

85105555 is a deficient number, since it is larger than the sum of its proper divisors (17021117).

85105555 is a wasteful number, since it uses less digits than its factorization.

85105555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17021116.

The product of its (nonzero) digits is 25000, while the sum is 34.

The square root of 85105555 is about 9225.2672048023. The cubic root of 85105555 is about 439.8648948140.

The spelling of 85105555 in words is "eighty-five million, one hundred five thousand, five hundred fifty-five".