665606597 has 2 divisors, whose sum is σ = 665606598. Its totient is φ = 665606596.

The previous prime is 665606581. The next prime is 665606629. The reversal of 665606597 is 795606566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 413146276 + 252460321 = 20326^2 + 15889^2 .

It is a cyclic number.

It is not a de Polignac number, because 665606597 - 2⁴ = 665606581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665606507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332803298 + 332803299.

It is an arithmetic number, because the mean of its divisors is an integer number (332803299).

Almost surely, 2^665606597 is an apocalyptic number.

It is an amenable number.

665606597 is a deficient number, since it is larger than the sum of its proper divisors (1).

665606597 is an equidigital number, since it uses as much as digits as its factorization.

665606597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The square root of 665606597 is about 25799.3526469173. The cubic root of 665606597 is about 873.1171910222.

The spelling of 665606597 in words is "six hundred sixty-five million, six hundred six thousand, five hundred ninety-seven".