667443161591 has 2 divisors, whose sum is σ = 667443161592. Its totient is φ = 667443161590.

The previous prime is 667443161551. The next prime is 667443161621. The reversal of 667443161591 is 195161344766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667443161591 - 2¹⁴ = 667443145207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667443161551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333721580795 + 333721580796.

It is an arithmetic number, because the mean of its divisors is an integer number (333721580796).

Almost surely, 2^667443161591 is an apocalyptic number.

667443161591 is a deficient number, since it is larger than the sum of its proper divisors (1).

667443161591 is an equidigital number, since it uses as much as digits as its factorization.

667443161591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 53.

The spelling of 667443161591 in words is "six hundred sixty-seven billion, four hundred forty-three million, one hundred sixty-one thousand, five hundred ninety-one".