6665221299 has 16 divisors (see below), whose sum is σ = 10205124480. Its totient is φ = 3826920960.

The previous prime is 6665221259. The next prime is 6665221301. The reversal of 6665221299 is 9921225666.

It is not a de Polignac number, because 6665221299 - 2¹¹ = 6665219251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6665221219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5314542 + ... + 5315795.

It is an arithmetic number, because the mean of its divisors is an integer number (637820280).

Almost surely, 2^6665221299 is an apocalyptic number.

6665221299 is a deficient number, since it is larger than the sum of its proper divisors (3539903181).

6665221299 is a wasteful number, since it uses less digits than its factorization.

6665221299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10630370.

The product of its digits is 699840, while the sum is 48.

The square root of 6665221299 is about 81640.8065797981. The cubic root of 6665221299 is about 1881.9360336264.

The spelling of 6665221299 in words is "six billion, six hundred sixty-five million, two hundred twenty-one thousand, two hundred ninety-nine".