665383573 has 2 divisors, whose sum is σ = 665383574. Its totient is φ = 665383572.

The previous prime is 665383561. The next prime is 665383577. The reversal of 665383573 is 375383566.

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., 400280049 + 265103524 = 20007^2 + 16282^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665383573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665383577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332691786 + 332691787.

It is an arithmetic number, because the mean of its divisors is an integer number (332691787).

Almost surely, 2^665383573 is an apocalyptic number.

It is an amenable number.

665383573 is a deficient number, since it is larger than the sum of its proper divisors (1).

665383573 is an equidigital number, since it uses as much as digits as its factorization.

665383573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 46.

The square root of 665383573 is about 25795.0300057976. The cubic root of 665383573 is about 873.0196620203.

The spelling of 665383573 in words is "six hundred sixty-five million, three hundred eighty-three thousand, five hundred seventy-three".