2640643451 has 2 divisors, whose sum is σ = 2640643452. Its totient is φ = 2640643450.

The previous prime is 2640643403. The next prime is 2640643531. The reversal of 2640643451 is 1543460462.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2640643451 is a prime.

It is not a weakly prime, because it can be changed into another prime (2640643051) 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, 1320321725 + 1320321726.

It is an arithmetic number, because the mean of its divisors is an integer number (1320321726).

Almost surely, 2^2640643451 is an apocalyptic number.

2640643451 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640643451 is an equidigital number, since it uses as much as digits as its factorization.

2640643451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 2640643451 is about 51387.1915072229. The cubic root of 2640643451 is about 1382.1969227077.

The spelling of 2640643451 in words is "two billion, six hundred forty million, six hundred forty-three thousand, four hundred fifty-one".