665356653499 has 2 divisors, whose sum is σ = 665356653500. Its totient is φ = 665356653498.

The previous prime is 665356653487. The next prime is 665356653517. The reversal of 665356653499 is 994356653566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665356653499 - 2²⁷ = 665222435771 is a prime.

It is not a weakly prime, because it can be changed into another prime (665356653449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332678326749 + 332678326750.

It is an arithmetic number, because the mean of its divisors is an integer number (332678326750).

Almost surely, 2^665356653499 is an apocalyptic number.

665356653499 is a deficient number, since it is larger than the sum of its proper divisors (1).

665356653499 is an equidigital number, since it uses as much as digits as its factorization.

665356653499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392000, while the sum is 67.

Adding to 665356653499 its sum of digits (67), we get a palindrome (665356653566).

The spelling of 665356653499 in words is "six hundred sixty-five billion, three hundred fifty-six million, six hundred fifty-three thousand, four hundred ninety-nine".