2604663557 has 2 divisors, whose sum is σ = 2604663558. Its totient is φ = 2604663556.

The previous prime is 2604663541. The next prime is 2604663577. The reversal of 2604663557 is 7553664062.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2142671521 + 461992036 = 46289^2 + 21494^2 .

It is a cyclic number.

It is not a de Polignac number, because 2604663557 - 2⁴ = 2604663541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2604663527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302331778 + 1302331779.

It is an arithmetic number, because the mean of its divisors is an integer number (1302331779).

Almost surely, 2^2604663557 is an apocalyptic number.

It is an amenable number.

2604663557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2604663557 is an equidigital number, since it uses as much as digits as its factorization.

2604663557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 44.

The square root of 2604663557 is about 51035.9045868690. The cubic root of 2604663557 is about 1375.8905185803.

The spelling of 2604663557 in words is "two billion, six hundred four million, six hundred sixty-three thousand, five hundred fifty-seven".