2664643 has 2 divisors, whose sum is σ = 2664644. Its totient is φ = 2664642.

The previous prime is 2664601. The next prime is 2664647. The reversal of 2664643 is 3464662.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2664643 is a prime.

It is not a weakly prime, because it can be changed into another prime (2664647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332321 + 1332322.

It is an arithmetic number, because the mean of its divisors is an integer number (1332322).

2^2664643 is an apocalyptic number.

2664643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2664643 is an equidigital number, since it uses as much as digits as its factorization.

2664643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 31.

The square root of 2664643 is about 1632.3734254147. The cubic root of 2664643 is about 138.6371676906.

The spelling of 2664643 in words is "two million, six hundred sixty-four thousand, six hundred forty-three".