2548797661 has 2 divisors, whose sum is σ = 2548797662. Its totient is φ = 2548797660.

The previous prime is 2548797653. The next prime is 2548797703. The reversal of 2548797661 is 1667978452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2161692036 + 387105625 = 46494^2 + 19675^2 .

It is a cyclic number.

It is not a de Polignac number, because 2548797661 - 2³ = 2548797653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2548795661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1274398830 + 1274398831.

It is an arithmetic number, because the mean of its divisors is an integer number (1274398831).

Almost surely, 2^2548797661 is an apocalyptic number.

It is an amenable number.

2548797661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2548797661 is an equidigital number, since it uses as much as digits as its factorization.

2548797661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 55.

The square root of 2548797661 is about 50485.6183581027. The cubic root of 2548797661 is about 1365.9824511292.

The spelling of 2548797661 in words is "two billion, five hundred forty-eight million, seven hundred ninety-seven thousand, six hundred sixty-one".