85581555 has 32 divisors (see below), whose sum is σ = 144099648. Its totient is φ = 43315200.

The previous prime is 85581547. The next prime is 85581557. The reversal of 85581555 is 55518558.

It is not a de Polignac number, because 85581555 - 2³ = 85581547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85581557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20875 + ... + 24635.

It is an arithmetic number, because the mean of its divisors is an integer number (4503114).

Almost surely, 2^85581555 is an apocalyptic number.

85581555 is a deficient number, since it is larger than the sum of its proper divisors (58518093).

85581555 is a wasteful number, since it uses less digits than its factorization.

85581555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3847.

The product of its digits is 200000, while the sum is 42.

The square root of 85581555 is about 9251.0299426604. The cubic root of 85581555 is about 440.6834334255.

The spelling of 85581555 in words is "eighty-five million, five hundred eighty-one thousand, five hundred fifty-five".