665349996784997 has 2 divisors, whose sum is σ = 665349996784998. Its totient is φ = 665349996784996.

The previous prime is 665349996784981. The next prime is 665349996785059. The reversal of 665349996784997 is 799487699943566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 432137576350561 + 233212420434436 = 20787919^2 + 15271294^2 .

It is a cyclic number.

It is not a de Polignac number, because 665349996784997 - 2⁴ = 665349996784981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665349996784897 and 665349996784906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665349996784927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332674998392498 + 332674998392499.

It is an arithmetic number, because the mean of its divisors is an integer number (332674998392499).

Almost surely, 2^{665349996784997} is an apocalyptic number.

It is an amenable number.

665349996784997 is a deficient number, since it is larger than the sum of its proper divisors (1).

665349996784997 is an equidigital number, since it uses as much as digits as its factorization.

665349996784997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1199951262720, while the sum is 101.

The spelling of 665349996784997 in words is "six hundred sixty-five trillion, three hundred forty-nine billion, nine hundred ninety-six million, seven hundred eighty-four thousand, nine hundred ninety-seven".