669693357191 has 2 divisors, whose sum is σ = 669693357192. Its totient is φ = 669693357190.

The previous prime is 669693357173. The next prime is 669693357217. The reversal of 669693357191 is 191753396966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669693357191 - 2⁶ = 669693357127 is a prime.

It is a super-2 number, since 2×669693357191² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669693357391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334846678595 + 334846678596.

It is an arithmetic number, because the mean of its divisors is an integer number (334846678596).

Almost surely, 2^669693357191 is an apocalyptic number.

669693357191 is a deficient number, since it is larger than the sum of its proper divisors (1).

669693357191 is an equidigital number, since it uses as much as digits as its factorization.

669693357191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49601160, while the sum is 65.

The spelling of 669693357191 in words is "six hundred sixty-nine billion, six hundred ninety-three million, three hundred fifty-seven thousand, one hundred ninety-one".