603642661 has 2 divisors, whose sum is σ = 603642662. Its totient is φ = 603642660.

The previous prime is 603642593. The next prime is 603642707. The reversal of 603642661 is 166246306.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 523540161 + 80102500 = 22881^2 + 8950^2 .

It is a cyclic number.

It is not a de Polignac number, because 603642661 - 2¹¹ = 603640613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (603642461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 301821330 + 301821331.

It is an arithmetic number, because the mean of its divisors is an integer number (301821331).

Almost surely, 2^603642661 is an apocalyptic number.

It is an amenable number.

603642661 is a deficient number, since it is larger than the sum of its proper divisors (1).

603642661 is an equidigital number, since it uses as much as digits as its factorization.

603642661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 603642661 is about 24569.1404204543. The cubic root of 603642661 is about 845.1360778947.

Adding to 603642661 its reverse (166246306), we get a palindrome (769888967).

The spelling of 603642661 in words is "six hundred three million, six hundred forty-two thousand, six hundred sixty-one".