6444168691 has 2 divisors, whose sum is σ = 6444168692. Its totient is φ = 6444168690.

The previous prime is 6444168683. The next prime is 6444168697. The reversal of 6444168691 is 1968614446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6444168691 - 2³ = 6444168683 is a prime.

It is not a weakly prime, because it can be changed into another prime (6444168697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222084345 + 3222084346.

It is an arithmetic number, because the mean of its divisors is an integer number (3222084346).

Almost surely, 2^6444168691 is an apocalyptic number.

6444168691 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444168691 is an equidigital number, since it uses as much as digits as its factorization.

6444168691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 49.

The square root of 6444168691 is about 80275.5796677919. The cubic root of 6444168691 is about 1860.8968476207.

The spelling of 6444168691 in words is "six billion, four hundred forty-four million, one hundred sixty-eight thousand, six hundred ninety-one".