665584444913 has 2 divisors, whose sum is σ = 665584444914. Its totient is φ = 665584444912.

The previous prime is 665584444891. The next prime is 665584444961. The reversal of 665584444913 is 319444485566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663675803569 + 1908641344 = 814663^2 + 43688^2 .

It is a cyclic number.

It is not a de Polignac number, because 665584444913 - 2¹⁶ = 665584379377 is a prime.

It is not a weakly prime, because it can be changed into another prime (665584443913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332792222456 + 332792222457.

It is an arithmetic number, because the mean of its divisors is an integer number (332792222457).

Almost surely, 2^665584444913 is an apocalyptic number.

It is an amenable number.

665584444913 is a deficient number, since it is larger than the sum of its proper divisors (1).

665584444913 is an equidigital number, since it uses as much as digits as its factorization.

665584444913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49766400, while the sum is 59.

The spelling of 665584444913 in words is "six hundred sixty-five billion, five hundred eighty-four million, four hundred forty-four thousand, nine hundred thirteen".