2604663521 has 2 divisors, whose sum is σ = 2604663522. Its totient is φ = 2604663520.

The previous prime is 2604663499. The next prime is 2604663527. The reversal of 2604663521 is 1253664062.

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., 1570140625 + 1034522896 = 39625^2 + 32164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2604663521 is a prime.

It is not a weakly prime, because it can be changed into another prime (2604663527) 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, 1302331760 + 1302331761.

It is an arithmetic number, because the mean of its divisors is an integer number (1302331761).

Almost surely, 2^2604663521 is an apocalyptic number.

It is an amenable number.

2604663521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2604663521 is an equidigital number, since it uses as much as digits as its factorization.

2604663521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 2604663521 is about 51035.9042341762. The cubic root of 2604663521 is about 1375.8905122414.

The spelling of 2604663521 in words is "two billion, six hundred four million, six hundred sixty-three thousand, five hundred twenty-one".