85808661 has 16 divisors (see below), whose sum is σ = 118180608. Its totient is φ = 55339200.

The previous prime is 85808659. The next prime is 85808687. The reversal of 85808661 is 16680858.

It is not a de Polignac number, because 85808661 - 2¹ = 85808659 is a prime.

It is a super-2 number, since 2×85808661² = 14726252605225842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85808621) 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, 17956 + ... + 22226.

It is an arithmetic number, because the mean of its divisors is an integer number (7386288).

Almost surely, 2^85808661 is an apocalyptic number.

It is an amenable number.

85808661 is a deficient number, since it is larger than the sum of its proper divisors (32371947).

85808661 is a wasteful number, since it uses less digits than its factorization.

85808661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4492.

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 85808661 is about 9263.2964434914. The cubic root of 85808661 is about 441.0728999554.

The spelling of 85808661 in words is "eighty-five million, eight hundred eight thousand, six hundred sixty-one".