665204461 has 2 divisors, whose sum is σ = 665204462. Its totient is φ = 665204460.

The previous prime is 665204429. The next prime is 665204531. The reversal of 665204461 is 164402566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389312361 + 275892100 = 19731^2 + 16610^2 .

It is a cyclic number.

It is not a de Polignac number, because 665204461 - 2⁵ = 665204429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665204401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332602230 + 332602231.

It is an arithmetic number, because the mean of its divisors is an integer number (332602231).

Almost surely, 2^665204461 is an apocalyptic number.

It is an amenable number.

665204461 is a deficient number, since it is larger than the sum of its proper divisors (1).

665204461 is an equidigital number, since it uses as much as digits as its factorization.

665204461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 665204461 is about 25791.5579405355. The cubic root of 665204461 is about 872.9413200749.

The spelling of 665204461 in words is "six hundred sixty-five million, two hundred four thousand, four hundred sixty-one".