66115861759 has 2 divisors, whose sum is σ = 66115861760. Its totient is φ = 66115861758.

The previous prime is 66115861753. The next prime is 66115861811. The reversal of 66115861759 is 95716851166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66115861759 - 2⁵ = 66115861727 is a prime.

It is a super-2 number, since 2×66115861759² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66115861753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33057930879 + 33057930880.

It is an arithmetic number, because the mean of its divisors is an integer number (33057930880).

Almost surely, 2^66115861759 is an apocalyptic number.

66115861759 is a deficient number, since it is larger than the sum of its proper divisors (1).

66115861759 is an equidigital number, since it uses as much as digits as its factorization.

66115861759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 55.

The spelling of 66115861759 in words is "sixty-six billion, one hundred fifteen million, eight hundred sixty-one thousand, seven hundred fifty-nine".