6665221259 has 2 divisors, whose sum is σ = 6665221260. Its totient is φ = 6665221258.

The previous prime is 6665221253. The next prime is 6665221301. The reversal of 6665221259 is 9521225666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6665221259 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6665221253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332610629 + 3332610630.

It is an arithmetic number, because the mean of its divisors is an integer number (3332610630).

Almost surely, 2^6665221259 is an apocalyptic number.

6665221259 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665221259 is an equidigital number, since it uses as much as digits as its factorization.

6665221259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 44.

The square root of 6665221259 is about 81640.8063348225. The cubic root of 6665221259 is about 1881.9360298617.

The spelling of 6665221259 in words is "six billion, six hundred sixty-five million, two hundred twenty-one thousand, two hundred fifty-nine".