85521667 has 16 divisors (see below), whose sum is σ = 110304000. Its totient is φ = 64340640.

The previous prime is 85521661. The next prime is 85521697. The reversal of 85521667 is 76612558.

It is not a de Polignac number, because 85521667 - 2¹¹ = 85519619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85521661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16917 + ... + 21382.

It is an arithmetic number, because the mean of its divisors is an integer number (6894000).

Almost surely, 2^85521667 is an apocalyptic number.

85521667 is a deficient number, since it is larger than the sum of its proper divisors (24782333).

85521667 is a wasteful number, since it uses less digits than its factorization.

85521667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38346.

The product of its digits is 100800, while the sum is 40.

The square root of 85521667 is about 9247.7925474137. The cubic root of 85521667 is about 440.5806160683.

It can be divided in two parts, 855 and 21667, that added together give a palindrome (22522).

The spelling of 85521667 in words is "eighty-five million, five hundred twenty-one thousand, six hundred sixty-seven".