7744018661 has 2 divisors, whose sum is σ = 7744018662. Its totient is φ = 7744018660.

The previous prime is 7744018621. The next prime is 7744018663. The reversal of 7744018661 is 1668104477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7024116100 + 719902561 = 83810^2 + 26831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7744018661 is a prime.

Together with 7744018663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7744018663) 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, 3872009330 + 3872009331.

It is an arithmetic number, because the mean of its divisors is an integer number (3872009331).

Almost surely, 2^7744018661 is an apocalyptic number.

It is an amenable number.

7744018661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7744018661 is an equidigital number, since it uses as much as digits as its factorization.

7744018661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 7744018661 is about 88000.1060283452. The cubic root of 7744018661 is about 1978.4365664672.

The spelling of 7744018661 in words is "seven billion, seven hundred forty-four million, eighteen thousand, six hundred sixty-one".