66705407999 has 2 divisors, whose sum is σ = 66705408000. Its totient is φ = 66705407998.

The previous prime is 66705407947. The next prime is 66705408017. The reversal of 66705407999 is 99970450766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66705407999 is a prime.

It is a super-2 number, since 2×66705407999² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66705407399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33352703999 + 33352704000.

It is an arithmetic number, because the mean of its divisors is an integer number (33352704000).

Almost surely, 2^66705407999 is an apocalyptic number.

66705407999 is a deficient number, since it is larger than the sum of its proper divisors (1).

66705407999 is an equidigital number, since it uses as much as digits as its factorization.

66705407999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25719120, while the sum is 62.

The spelling of 66705407999 in words is "sixty-six billion, seven hundred five million, four hundred seven thousand, nine hundred ninety-nine".