667740737 has 2 divisors, whose sum is σ = 667740738. Its totient is φ = 667740736.

The previous prime is 667740707. The next prime is 667740743. The reversal of 667740737 is 737047766.

It is a happy number.

667740737 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451180081 + 216560656 = 21241^2 + 14716^2 .

It is a cyclic number.

It is not a de Polignac number, because 667740737 - 2²⁰ = 666692161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667740691 and 667740700.

It is not a weakly prime, because it can be changed into another prime (667740707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333870368 + 333870369.

It is an arithmetic number, because the mean of its divisors is an integer number (333870369).

Almost surely, 2^667740737 is an apocalyptic number.

It is an amenable number.

667740737 is a deficient number, since it is larger than the sum of its proper divisors (1).

667740737 is an equidigital number, since it uses as much as digits as its factorization.

667740737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1037232, while the sum is 47.

The square root of 667740737 is about 25840.6798865665. The cubic root of 667740737 is about 874.0493564455.

The spelling of 667740737 in words is "six hundred sixty-seven million, seven hundred forty thousand, seven hundred thirty-seven".