2640340663 has 2 divisors, whose sum is σ = 2640340664. Its totient is φ = 2640340662.

The previous prime is 2640340631. The next prime is 2640340709. The reversal of 2640340663 is 3660430462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2640340663 - 2⁵ = 2640340631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2640340603) 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, 1320170331 + 1320170332.

It is an arithmetic number, because the mean of its divisors is an integer number (1320170332).

Almost surely, 2^2640340663 is an apocalyptic number.

2640340663 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640340663 is an equidigital number, since it uses as much as digits as its factorization.

2640340663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 34.

The square root of 2640340663 is about 51384.2452800467. The cubic root of 2640340663 is about 1382.1440910593.

The spelling of 2640340663 in words is "two billion, six hundred forty million, three hundred forty thousand, six hundred sixty-three".