6664506643 has 2 divisors, whose sum is σ = 6664506644. Its totient is φ = 6664506642.

The previous prime is 6664506631. The next prime is 6664506647. The reversal of 6664506643 is 3466054666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6664506643 is a prime.

It is a super-2 number, since 2×6664506643² = 88831297589182258898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6664506593 and 6664506602.

It is not a weakly prime, because it can be changed into another prime (6664506647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332253321 + 3332253322.

It is an arithmetic number, because the mean of its divisors is an integer number (3332253322).

Almost surely, 2^6664506643 is an apocalyptic number.

6664506643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664506643 is an equidigital number, since it uses as much as digits as its factorization.

6664506643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 46.

The square root of 6664506643 is about 81636.4296316295. The cubic root of 6664506643 is about 1881.8687697958.

The spelling of 6664506643 in words is "six billion, six hundred sixty-four million, five hundred six thousand, six hundred forty-three".