6661139759 has 2 divisors, whose sum is σ = 6661139760. Its totient is φ = 6661139758.

The previous prime is 6661139741. The next prime is 6661139773. The reversal of 6661139759 is 9579311666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6661139759 - 2²⁰ = 6660091183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6661139759.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6661139789) 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, 3330569879 + 3330569880.

It is an arithmetic number, because the mean of its divisors is an integer number (3330569880).

Almost surely, 2^6661139759 is an apocalyptic number.

6661139759 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661139759 is an equidigital number, since it uses as much as digits as its factorization.

6661139759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 53.

The square root of 6661139759 is about 81615.8058160305. The cubic root of 6661139759 is about 1881.5518120438.

The spelling of 6661139759 in words is "six billion, six hundred sixty-one million, one hundred thirty-nine thousand, seven hundred fifty-nine".