2644020257 has 2 divisors, whose sum is σ = 2644020258. Its totient is φ = 2644020256.

The previous prime is 2644020241. The next prime is 2644020289. The reversal of 2644020257 is 7520204462.

It is an a-pointer prime, because the next prime (2644020289) can be obtained adding 2644020257 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2107819921 + 536200336 = 45911^2 + 23156^2 .

It is a cyclic number.

It is not a de Polignac number, because 2644020257 - 2⁴ = 2644020241 is a prime.

It is not a weakly prime, because it can be changed into another prime (2644070257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322010128 + 1322010129.

It is an arithmetic number, because the mean of its divisors is an integer number (1322010129).

Almost surely, 2^2644020257 is an apocalyptic number.

It is an amenable number.

2644020257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2644020257 is an equidigital number, since it uses as much as digits as its factorization.

2644020257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 2644020257 is about 51420.0375048482. The cubic root of 2644020257 is about 1382.7858476960.

The spelling of 2644020257 in words is "two billion, six hundred forty-four million, twenty thousand, two hundred fifty-seven".