4444666691 has 2 divisors, whose sum is σ = 4444666692. Its totient is φ = 4444666690.

The previous prime is 4444666661. The next prime is 4444666727. The reversal of 4444666691 is 1966664444.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4444666691 is a prime.

It is not a weakly prime, because it can be changed into another prime (4444666601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2222333345 + 2222333346.

It is an arithmetic number, because the mean of its divisors is an integer number (2222333346).

Almost surely, 2^4444666691 is an apocalyptic number.

4444666691 is a deficient number, since it is larger than the sum of its proper divisors (1).

4444666691 is an equidigital number, since it uses as much as digits as its factorization.

4444666691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 50.

The square root of 4444666691 is about 66668.3334949960. Note that the first 3 decimals coincide. The cubic root of 4444666691 is about 1644.1687877871.

The spelling of 4444666691 in words is "four billion, four hundred forty-four million, six hundred sixty-six thousand, six hundred ninety-one".