66612566459 has 2 divisors, whose sum is σ = 66612566460. Its totient is φ = 66612566458.

The previous prime is 66612566411. The next prime is 66612566473. The reversal of 66612566459 is 95466521666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66612566459 - 2²⁸ = 66344131003 is a prime.

It is not a weakly prime, because it can be changed into another prime (66612166459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33306283229 + 33306283230.

It is an arithmetic number, because the mean of its divisors is an integer number (33306283230).

Almost surely, 2^66612566459 is an apocalyptic number.

66612566459 is a deficient number, since it is larger than the sum of its proper divisors (1).

66612566459 is an equidigital number, since it uses as much as digits as its factorization.

66612566459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13996800, while the sum is 56.

The spelling of 66612566459 in words is "sixty-six billion, six hundred twelve million, five hundred sixty-six thousand, four hundred fifty-nine".