667165693 has 2 divisors, whose sum is σ = 667165694. Its totient is φ = 667165692.

The previous prime is 667165679. The next prime is 667165721. The reversal of 667165693 is 396561766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664969369 + 2196324 = 25787^2 + 1482^2 .

It is a cyclic number.

It is not a de Polignac number, because 667165693 - 2²¹ = 665068541 is a prime.

It is a super-2 number, since 2×667165693² = 890220123832340498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667160693) 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, 333582846 + 333582847.

It is an arithmetic number, because the mean of its divisors is an integer number (333582847).

Almost surely, 2^667165693 is an apocalyptic number.

It is an amenable number.

667165693 is a deficient number, since it is larger than the sum of its proper divisors (1).

667165693 is an equidigital number, since it uses as much as digits as its factorization.

667165693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 49.

The square root of 667165693 is about 25829.5507703870. The cubic root of 667165693 is about 873.7983802007.

The spelling of 667165693 in words is "six hundred sixty-seven million, one hundred sixty-five thousand, six hundred ninety-three".