667516669 has 2 divisors, whose sum is σ = 667516670. Its totient is φ = 667516668.

The previous prime is 667516639. The next prime is 667516673. The reversal of 667516669 is 966615766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 652189444 + 15327225 = 25538^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 667516669 - 2¹¹ = 667514621 is a prime.

It is a super-2 number, since 2×667516669² = 891157006785711122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667516639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333758334 + 333758335.

It is an arithmetic number, because the mean of its divisors is an integer number (333758335).

Almost surely, 2^667516669 is an apocalyptic number.

It is an amenable number.

667516669 is a deficient number, since it is larger than the sum of its proper divisors (1).

667516669 is an equidigital number, since it uses as much as digits as its factorization.

667516669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 52.

The square root of 667516669 is about 25836.3439557535. The cubic root of 667516669 is about 873.9515797733.

The spelling of 667516669 in words is "six hundred sixty-seven million, five hundred sixteen thousand, six hundred sixty-nine".