2643648757 has 2 divisors, whose sum is σ = 2643648758. Its totient is φ = 2643648756.

The previous prime is 2643648713. The next prime is 2643648793. The reversal of 2643648757 is 7578463462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2536028881 + 107619876 = 50359^2 + 10374^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643648757 - 2⁷ = 2643648629 is a prime.

It is a super-3 number, since 3×2643648757³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2643648157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321824378 + 1321824379.

It is an arithmetic number, because the mean of its divisors is an integer number (1321824379).

Almost surely, 2^2643648757 is an apocalyptic number.

It is an amenable number.

2643648757 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643648757 is an equidigital number, since it uses as much as digits as its factorization.

2643648757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6773760, while the sum is 52.

The square root of 2643648757 is about 51416.4249729598. The cubic root of 2643648757 is about 1382.7210815503.

The spelling of 2643648757 in words is "two billion, six hundred forty-three million, six hundred forty-eight thousand, seven hundred fifty-seven".