2643916729 has 2 divisors, whose sum is σ = 2643916730. Its totient is φ = 2643916728.

The previous prime is 2643916727. The next prime is 2643916757. The reversal of 2643916729 is 9276193462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2408355625 + 235561104 = 49075^2 + 15348^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643916729 - 2¹ = 2643916727 is a prime.

Together with 2643916727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2643916727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321958364 + 1321958365.

It is an arithmetic number, because the mean of its divisors is an integer number (1321958365).

Almost surely, 2^2643916729 is an apocalyptic number.

It is an amenable number.

2643916729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643916729 is an equidigital number, since it uses as much as digits as its factorization.

2643916729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 49.

The square root of 2643916729 is about 51419.0308057241. The cubic root of 2643916729 is about 1382.7677995588.

The spelling of 2643916729 in words is "two billion, six hundred forty-three million, nine hundred sixteen thousand, seven hundred twenty-nine".