6620666215 has 16 divisors (see below), whose sum is σ = 8257747680. Its totient is φ = 5089633920.

The previous prime is 6620666207. The next prime is 6620666237. The reversal of 6620666215 is 5126660266.

It is not a de Polignac number, because 6620666215 - 2³ = 6620666207 is a prime.

It is a super-2 number, since 2×6620666215² = 87666442260884852450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77604 + ... + 138793.

It is an arithmetic number, because the mean of its divisors is an integer number (516109230).

Almost surely, 2^6620666215 is an apocalyptic number.

6620666215 is a deficient number, since it is larger than the sum of its proper divisors (1637081465).

6620666215 is a wasteful number, since it uses less digits than its factorization.

6620666215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216642.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 6620666215 is about 81367.4763956705. The cubic root of 6620666215 is about 1877.7332548262.

The spelling of 6620666215 in words is "six billion, six hundred twenty million, six hundred sixty-six thousand, two hundred fifteen".