667663739 has 2 divisors, whose sum is σ = 667663740. Its totient is φ = 667663738.

The previous prime is 667663699. The next prime is 667663807. The reversal of 667663739 is 937366766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667663739 - 2²⁸ = 399228283 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (667623739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333831869 + 333831870.

It is an arithmetic number, because the mean of its divisors is an integer number (333831870).

Almost surely, 2^667663739 is an apocalyptic number.

667663739 is a deficient number, since it is larger than the sum of its proper divisors (1).

667663739 is an equidigital number, since it uses as much as digits as its factorization.

667663739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5143824, while the sum is 53.

The square root of 667663739 is about 25839.1899834341. The cubic root of 667663739 is about 874.0157592545.

The spelling of 667663739 in words is "six hundred sixty-seven million, six hundred sixty-three thousand, seven hundred thirty-nine".