667756667 has 2 divisors, whose sum is σ = 667756668. Its totient is φ = 667756666.

The previous prime is 667756619. The next prime is 667756693. The reversal of 667756667 is 766657766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667756667 - 2¹⁶ = 667691131 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (667756967) 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, 333878333 + 333878334.

It is an arithmetic number, because the mean of its divisors is an integer number (333878334).

Almost surely, 2^667756667 is an apocalyptic number.

667756667 is a deficient number, since it is larger than the sum of its proper divisors (1).

667756667 is an equidigital number, since it uses as much as digits as its factorization.

667756667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13335840, while the sum is 56.

The square root of 667756667 is about 25840.9881196521. The cubic root of 667756667 is about 874.0563069952.

The spelling of 667756667 in words is "six hundred sixty-seven million, seven hundred fifty-six thousand, six hundred sixty-seven".