667307261 has 2 divisors, whose sum is σ = 667307262. Its totient is φ = 667307260.

The previous prime is 667307237. The next prime is 667307293. The reversal of 667307261 is 162703766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 440202361 + 227104900 = 20981^2 + 15070^2 .

It is a cyclic number.

It is not a de Polignac number, because 667307261 - 2¹⁸ = 667045117 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 (667307561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333653630 + 333653631.

It is an arithmetic number, because the mean of its divisors is an integer number (333653631).

Almost surely, 2^667307261 is an apocalyptic number.

It is an amenable number.

667307261 is a deficient number, since it is larger than the sum of its proper divisors (1).

667307261 is an equidigital number, since it uses as much as digits as its factorization.

667307261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 667307261 is about 25832.2910520921. The cubic root of 667307261 is about 873.8601805110.

The spelling of 667307261 in words is "six hundred sixty-seven million, three hundred seven thousand, two hundred sixty-one".