66403369687 has 2 divisors, whose sum is σ = 66403369688. Its totient is φ = 66403369686.

The previous prime is 66403369663. The next prime is 66403369709. The reversal of 66403369687 is 78696330466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66403369687 - 2⁷ = 66403369559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66403360687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33201684843 + 33201684844.

It is an arithmetic number, because the mean of its divisors is an integer number (33201684844).

Almost surely, 2^66403369687 is an apocalyptic number.

66403369687 is a deficient number, since it is larger than the sum of its proper divisors (1).

66403369687 is an equidigital number, since it uses as much as digits as its factorization.

66403369687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23514624, while the sum is 58.

The spelling of 66403369687 in words is "sixty-six billion, four hundred three million, three hundred sixty-nine thousand, six hundred eighty-seven".