6665320619 has 2 divisors, whose sum is σ = 6665320620. Its totient is φ = 6665320618.

The previous prime is 6665320603. The next prime is 6665320643. The reversal of 6665320619 is 9160235666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6665320619 - 2⁴ = 6665320603 is a prime.

It is a super-2 number, since 2×6665320619² = 88852997908133086322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6665320619.

It is not a weakly prime, because it can be changed into another prime (6665320219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332660309 + 3332660310.

It is an arithmetic number, because the mean of its divisors is an integer number (3332660310).

Almost surely, 2^6665320619 is an apocalyptic number.

6665320619 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665320619 is an equidigital number, since it uses as much as digits as its factorization.

6665320619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 6665320619 is about 81641.4148517773. The cubic root of 6665320619 is about 1881.9453813010.

The spelling of 6665320619 in words is "six billion, six hundred sixty-five million, three hundred twenty thousand, six hundred nineteen".