2643639511 has 2 divisors, whose sum is σ = 2643639512. Its totient is φ = 2643639510.

The previous prime is 2643639497. The next prime is 2643639521. The reversal of 2643639511 is 1159363462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2643639511 - 2⁹ = 2643638999 is a prime.

It is a super-3 number, since 3×2643639511³ (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 (2643639521) 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, 1321819755 + 1321819756.

It is an arithmetic number, because the mean of its divisors is an integer number (1321819756).

Almost surely, 2^2643639511 is an apocalyptic number.

2643639511 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643639511 is an equidigital number, since it uses as much as digits as its factorization.

2643639511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The square root of 2643639511 is about 51416.3350599787. The cubic root of 2643639511 is about 1382.7194695543.

The spelling of 2643639511 in words is "two billion, six hundred forty-three million, six hundred thirty-nine thousand, five hundred eleven".