665989924507 has 2 divisors, whose sum is σ = 665989924508. Its totient is φ = 665989924506.

The previous prime is 665989924499. The next prime is 665989924531. The reversal of 665989924507 is 705429989566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665989924507 - 2³ = 665989924499 is a prime.

It is not a weakly prime, because it can be changed into another prime (665989928507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332994962253 + 332994962254.

It is an arithmetic number, because the mean of its divisors is an integer number (332994962254).

Almost surely, 2^665989924507 is an apocalyptic number.

665989924507 is a deficient number, since it is larger than the sum of its proper divisors (1).

665989924507 is an equidigital number, since it uses as much as digits as its factorization.

665989924507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 293932800, while the sum is 70.

The spelling of 665989924507 in words is "six hundred sixty-five billion, nine hundred eighty-nine million, nine hundred twenty-four thousand, five hundred seven".