666666740767 has 2 divisors, whose sum is σ = 666666740768. Its totient is φ = 666666740766.

The previous prime is 666666740731. The next prime is 666666740783. The reversal of 666666740767 is 767047666666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666666740767 - 2²³ = 666658352159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666666740567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333333370383 + 333333370384.

It is an arithmetic number, because the mean of its divisors is an integer number (333333370384).

Almost surely, 2^666666740767 is an apocalyptic number.

666666740767 is a deficient number, since it is larger than the sum of its proper divisors (1).

666666740767 is an equidigital number, since it uses as much as digits as its factorization.

666666740767 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384072192, while the sum is 67.

The spelling of 666666740767 in words is "six hundred sixty-six billion, six hundred sixty-six million, seven hundred forty thousand, seven hundred sixty-seven".