6644869739 has 2 divisors, whose sum is σ = 6644869740. Its totient is φ = 6644869738.

The previous prime is 6644869723. The next prime is 6644869757. The reversal of 6644869739 is 9379684466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6644869739 - 2⁴ = 6644869723 is a prime.

It is not a weakly prime, because it can be changed into another prime (6644869769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322434869 + 3322434870.

It is an arithmetic number, because the mean of its divisors is an integer number (3322434870).

Almost surely, 2^6644869739 is an apocalyptic number.

6644869739 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644869739 is an equidigital number, since it uses as much as digits as its factorization.

6644869739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47029248, while the sum is 62.

The square root of 6644869739 is about 81516.0704339948. The cubic root of 6644869739 is about 1880.0186488078.

The spelling of 6644869739 in words is "six billion, six hundred forty-four million, eight hundred sixty-nine thousand, seven hundred thirty-nine".