604515661 has 2 divisors, whose sum is σ = 604515662. Its totient is φ = 604515660.

The previous prime is 604515617. The next prime is 604515683. The reversal of 604515661 is 166515406.

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., 581533225 + 22982436 = 24115^2 + 4794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-604515661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (604515161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302257830 + 302257831.

It is an arithmetic number, because the mean of its divisors is an integer number (302257831).

Almost surely, 2^604515661 is an apocalyptic number.

It is an amenable number.

604515661 is a deficient number, since it is larger than the sum of its proper divisors (1).

604515661 is an equidigital number, since it uses as much as digits as its factorization.

604515661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 604515661 is about 24586.9001909553. The cubic root of 604515661 is about 845.5432991719.

The spelling of 604515661 in words is "six hundred four million, five hundred fifteen thousand, six hundred sixty-one".