2640643403 has 2 divisors, whose sum is σ = 2640643404. Its totient is φ = 2640643402.

The previous prime is 2640643391. The next prime is 2640643451. The reversal of 2640643403 is 3043460462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2640643403 - 2⁶ = 2640643339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2640643403.

It is not a weakly prime, because it can be changed into another prime (2640643003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320321701 + 1320321702.

It is an arithmetic number, because the mean of its divisors is an integer number (1320321702).

Almost surely, 2^2640643403 is an apocalyptic number.

2640643403 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640643403 is an equidigital number, since it uses as much as digits as its factorization.

2640643403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 32.

The square root of 2640643403 is about 51387.1910401804. The cubic root of 2640643403 is about 1382.1969143327.

The spelling of 2640643403 in words is "two billion, six hundred forty million, six hundred forty-three thousand, four hundred three".