85663221 has 64 divisors (see below), whose sum is σ = 145152000. Its totient is φ = 44744448.

The previous prime is 85663213. The next prime is 85663241. The reversal of 85663221 is 12236658.

It is not a de Polignac number, because 85663221 - 2³ = 85663213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85663241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1032046 + ... + 1032128.

It is an arithmetic number, because the mean of its divisors is an integer number (2268000).

Almost surely, 2^85663221 is an apocalyptic number.

It is an amenable number.

85663221 is a deficient number, since it is larger than the sum of its proper divisors (59488779).

85663221 is a wasteful number, since it uses less digits than its factorization.

85663221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 169 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 85663221 is about 9255.4427770907. The cubic root of 85663221 is about 440.8235625764.

Adding to 85663221 its reverse (12236658), we get a palindrome (97899879).

The spelling of 85663221 in words is "eighty-five million, six hundred sixty-three thousand, two hundred twenty-one".