667661359 has 2 divisors, whose sum is σ = 667661360. Its totient is φ = 667661358.

The previous prime is 667661327. The next prime is 667661369. The reversal of 667661359 is 953166766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667661359 - 2⁵ = 667661327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667661369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333830679 + 333830680.

It is an arithmetic number, because the mean of its divisors is an integer number (333830680).

Almost surely, 2^667661359 is an apocalyptic number.

667661359 is a deficient number, since it is larger than the sum of its proper divisors (1).

667661359 is an equidigital number, since it uses as much as digits as its factorization.

667661359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 49.

The square root of 667661359 is about 25839.1439293178. The cubic root of 667661359 is about 874.0147207277.

The spelling of 667661359 in words is "six hundred sixty-seven million, six hundred sixty-one thousand, three hundred fifty-nine".