6666172215 has 32 divisors (see below), whose sum is σ = 10762592256. Its totient is φ = 3523121280.

The previous prime is 6666172199. The next prime is 6666172217. The reversal of 6666172215 is 5122716666.

It is not a de Polignac number, because 6666172215 - 2⁴ = 6666172199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666172217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2248324 + ... + 2251286.

It is an arithmetic number, because the mean of its divisors is an integer number (336331008).

Almost surely, 2^6666172215 is an apocalyptic number.

6666172215 is a deficient number, since it is larger than the sum of its proper divisors (4096420041).

6666172215 is a wasteful number, since it uses less digits than its factorization.

6666172215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4279.

The product of its digits is 181440, while the sum is 42.

The square root of 6666172215 is about 81646.6301509131. The cubic root of 6666172215 is about 1882.0255269284.

The spelling of 6666172215 in words is "six billion, six hundred sixty-six million, one hundred seventy-two thousand, two hundred fifteen".