6619164509 has 2 divisors, whose sum is σ = 6619164510. Its totient is φ = 6619164508.

The previous prime is 6619164481. The next prime is 6619164529. The reversal of 6619164509 is 9054619166.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4967148484 + 1652016025 = 70478^2 + 40645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6619164509 is a prime.

It is a super-2 number, since 2×6619164509² = 87626677594410422162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6619164529) 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 as a sum of consecutive naturals, namely, 3309582254 + 3309582255.

It is an arithmetic number, because the mean of its divisors is an integer number (3309582255).

Almost surely, 2^6619164509 is an apocalyptic number.

It is an amenable number.

6619164509 is a deficient number, since it is larger than the sum of its proper divisors (1).

6619164509 is an equidigital number, since it uses as much as digits as its factorization.

6619164509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 6619164509 is about 81358.2479469660. The cubic root of 6619164509 is about 1877.5912743252.

The spelling of 6619164509 in words is "six billion, six hundred nineteen million, one hundred sixty-four thousand, five hundred nine".