665641163353 has 2 divisors, whose sum is σ = 665641163354. Its totient is φ = 665641163352.

The previous prime is 665641163311. The next prime is 665641163357. The reversal of 665641163353 is 353361146566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575417824969 + 90223338384 = 758563^2 + 300372^2 .

It is a cyclic number.

It is not a de Polignac number, because 665641163353 - 2²⁹ = 665104292441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665641163297 and 665641163306.

It is not a weakly prime, because it can be changed into another prime (665641163357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332820581676 + 332820581677.

It is an arithmetic number, because the mean of its divisors is an integer number (332820581677).

Almost surely, 2^665641163353 is an apocalyptic number.

It is an amenable number.

665641163353 is a deficient number, since it is larger than the sum of its proper divisors (1).

665641163353 is an equidigital number, since it uses as much as digits as its factorization.

665641163353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3499200, while the sum is 49.

The spelling of 665641163353 in words is "six hundred sixty-five billion, six hundred forty-one million, one hundred sixty-three thousand, three hundred fifty-three".