85218155 has 16 divisors (see below), whose sum is σ = 111833568. Its totient is φ = 61824000.

The previous prime is 85218149. The next prime is 85218157. The reversal of 85218155 is 55181258.

It is not a de Polignac number, because 85218155 - 2⁴ = 85218139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85218157) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 23675 + ... + 27035.

It is an arithmetic number, because the mean of its divisors is an integer number (6989598).

Almost surely, 2^85218155 is an apocalyptic number.

85218155 is a deficient number, since it is larger than the sum of its proper divisors (26615413).

85218155 is a wasteful number, since it uses less digits than its factorization.

85218155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3838.

The product of its digits is 16000, while the sum is 35.

The square root of 85218155 is about 9231.3679917984. The cubic root of 85218155 is about 440.0587989603.

The spelling of 85218155 in words is "eighty-five million, two hundred eighteen thousand, one hundred fifty-five".