2643916817 has 2 divisors, whose sum is σ = 2643916818. Its totient is φ = 2643916816.

The previous prime is 2643916799. The next prime is 2643916829. The reversal of 2643916817 is 7186193462.

2643916817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1814419216 + 829497601 = 42596^2 + 28801^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643916817 - 2¹⁶ = 2643851281 is a prime.

It is a super-2 number, since 2×2643916817² = 13980592270430822978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2643216817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321958408 + 1321958409.

It is an arithmetic number, because the mean of its divisors is an integer number (1321958409).

Almost surely, 2^2643916817 is an apocalyptic number.

It is an amenable number.

2643916817 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643916817 is an equidigital number, since it uses as much as digits as its factorization.

2643916817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 2643916817 is about 51419.0316614384. The cubic root of 2643916817 is about 1382.7678149001.

The spelling of 2643916817 in words is "two billion, six hundred forty-three million, nine hundred sixteen thousand, eight hundred seventeen".