667760741 has 2 divisors, whose sum is σ = 667760742. Its totient is φ = 667760740.

The previous prime is 667760729. The next prime is 667760767. The reversal of 667760741 is 147067766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 650505025 + 17255716 = 25505^2 + 4154^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667760741 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 667760692 and 667760701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667760701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333880370 + 333880371.

It is an arithmetic number, because the mean of its divisors is an integer number (333880371).

Almost surely, 2^667760741 is an apocalyptic number.

It is an amenable number.

667760741 is a deficient number, since it is larger than the sum of its proper divisors (1).

667760741 is an equidigital number, since it uses as much as digits as its factorization.

667760741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 667760741 is about 25841.0669477868. The cubic root of 667760741 is about 874.0580845380.

The spelling of 667760741 in words is "six hundred sixty-seven million, seven hundred sixty thousand, seven hundred forty-one".