667723361 has 2 divisors, whose sum is σ = 667723362. Its totient is φ = 667723360.

The previous prime is 667723333. The next prime is 667723369. The reversal of 667723361 is 163327766.

667723361 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., 413512225 + 254211136 = 20335^2 + 15944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667723361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (667723369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333861680 + 333861681.

It is an arithmetic number, because the mean of its divisors is an integer number (333861681).

Almost surely, 2^667723361 is an apocalyptic number.

It is an amenable number.

667723361 is a deficient number, since it is larger than the sum of its proper divisors (1).

667723361 is an equidigital number, since it uses as much as digits as its factorization.

667723361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 41.

The square root of 667723361 is about 25840.3436703152. The cubic root of 667723361 is about 874.0417748536.

The spelling of 667723361 in words is "six hundred sixty-seven million, seven hundred twenty-three thousand, three hundred sixty-one".