845662221 has 16 divisors (see below), whose sum is σ = 1264331200. Its totient is φ = 558600624.

The previous prime is 845662217. The next prime is 845662231. The reversal of 845662221 is 122266548.

It is a happy number.

845662221 is a `hidden beast` number, since 8 + 4 + 5 + 6 + 622 + 21 = 666.

It is not a de Polignac number, because 845662221 - 2² = 845662217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845662201) 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, 140731 + ... + 146616.

It is an arithmetic number, because the mean of its divisors is an integer number (79020700).

Almost surely, 2^845662221 is an apocalyptic number.

It is an amenable number.

845662221 is a deficient number, since it is larger than the sum of its proper divisors (418668979).

845662221 is a wasteful number, since it uses less digits than its factorization.

845662221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287465 (or 287459 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 845662221 is about 29080.2720241747. The cubic root of 845662221 is about 945.6540999318.

The spelling of 845662221 in words is "eight hundred forty-five million, six hundred sixty-two thousand, two hundred twenty-one".