6372166221 has 24 divisors (see below), whose sum is σ = 9322840800. Its totient is φ = 4193457696.

The previous prime is 6372166187. The next prime is 6372166223. The reversal of 6372166221 is 1226612736.

6372166221 is a `hidden beast` number, since 6 + 3 + 7 + 21 + 6 + 622 + 1 = 666.

It is not a de Polignac number, because 6372166221 - 2⁷ = 6372166093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6372166223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1154350 + ... + 1159856.

It is an arithmetic number, because the mean of its divisors is an integer number (388451700).

Almost surely, 2^6372166221 is an apocalyptic number.

It is an amenable number.

6372166221 is a deficient number, since it is larger than the sum of its proper divisors (2950674579).

6372166221 is a wasteful number, since it uses less digits than its factorization.

6372166221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7145 (or 7142 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 6372166221 is about 79825.8493283974. The cubic root of 6372166221 is about 1853.9401022043.

Adding to 6372166221 its reverse (1226612736), we get a palindrome (7598778957).

The spelling of 6372166221 in words is "six billion, three hundred seventy-two million, one hundred sixty-six thousand, two hundred twenty-one".