665499999907 has 2 divisors, whose sum is σ = 665499999908. Its totient is φ = 665499999906.

The previous prime is 665499999887. The next prime is 665499999919. The reversal of 665499999907 is 709999994566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665499999907 - 2¹¹ = 665499997859 is a prime.

It is not a weakly prime, because it can be changed into another prime (665499999977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332749999953 + 332749999954.

It is an arithmetic number, because the mean of its divisors is an integer number (332749999954).

Almost surely, 2^665499999907 is an apocalyptic number.

665499999907 is a deficient number, since it is larger than the sum of its proper divisors (1).

665499999907 is an equidigital number, since it uses as much as digits as its factorization.

665499999907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2678462640, while the sum is 82.

The spelling of 665499999907 in words is "six hundred sixty-five billion, four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seven".