66663266687 has 2 divisors, whose sum is σ = 66663266688. Its totient is φ = 66663266686.

The previous prime is 66663266641. The next prime is 66663266737. The reversal of 66663266687 is 78666236666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66663266687 - 2¹⁰ = 66663265663 is a prime.

It is a super-2 number, since 2×66663266687² (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 (66663266617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33331633343 + 33331633344.

It is an arithmetic number, because the mean of its divisors is an integer number (33331633344).

Almost surely, 2^66663266687 is an apocalyptic number.

66663266687 is a deficient number, since it is larger than the sum of its proper divisors (1).

66663266687 is an equidigital number, since it uses as much as digits as its factorization.

66663266687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94058496, while the sum is 62.

The spelling of 66663266687 in words is "sixty-six billion, six hundred sixty-three million, two hundred sixty-six thousand, six hundred eighty-seven".