605604999661 has 2 divisors, whose sum is σ = 605604999662. Its totient is φ = 605604999660.

The previous prime is 605604999607. The next prime is 605604999683. The reversal of 605604999661 is 166999406506.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575976262761 + 29628736900 = 758931^2 + 172130^2 .

It is a cyclic number.

It is not a de Polignac number, because 605604999661 - 2⁷ = 605604999533 is a prime.

It is a super-2 number, since 2×605604999661² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 605604999661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (605604993661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302802499830 + 302802499831.

It is an arithmetic number, because the mean of its divisors is an integer number (302802499831).

Almost surely, 2^605604999661 is an apocalyptic number.

It is an amenable number.

605604999661 is a deficient number, since it is larger than the sum of its proper divisors (1).

605604999661 is an equidigital number, since it uses as much as digits as its factorization.

605604999661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18895680, while the sum is 61.

The spelling of 605604999661 in words is "six hundred five billion, six hundred four million, nine hundred ninety-nine thousand, six hundred sixty-one".