667776623 has 2 divisors, whose sum is σ = 667776624. Its totient is φ = 667776622.

The previous prime is 667776563. The next prime is 667776647. The reversal of 667776623 is 326677766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667776623 - 2⁶ = 667776559 is a prime.

It is a super-3 number, since 3×667776623³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667776653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333888311 + 333888312.

It is an arithmetic number, because the mean of its divisors is an integer number (333888312).

Almost surely, 2^667776623 is an apocalyptic number.

667776623 is a deficient number, since it is larger than the sum of its proper divisors (1).

667776623 is an equidigital number, since it uses as much as digits as its factorization.

667776623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2667168, while the sum is 50.

The square root of 667776623 is about 25841.3742475125. The cubic root of 667776623 is about 874.0650140062.

The spelling of 667776623 in words is "six hundred sixty-seven million, seven hundred seventy-six thousand, six hundred twenty-three".