667698701 has 2 divisors, whose sum is σ = 667698702. Its totient is φ = 667698700.

The previous prime is 667698679. The next prime is 667698719. The reversal of 667698701 is 107896766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499477801 + 168220900 = 22349^2 + 12970^2 .

It is a cyclic number.

It is not a de Polignac number, because 667698701 - 2¹⁸ = 667436557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 667698701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667698791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333849350 + 333849351.

It is an arithmetic number, because the mean of its divisors is an integer number (333849351).

Almost surely, 2^667698701 is an apocalyptic number.

It is an amenable number.

667698701 is a deficient number, since it is larger than the sum of its proper divisors (1).

667698701 is an equidigital number, since it uses as much as digits as its factorization.

667698701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 667698701 is about 25839.8665050731. The cubic root of 667698701 is about 874.0310148409.

The spelling of 667698701 in words is "six hundred sixty-seven million, six hundred ninety-eight thousand, seven hundred one".