667267218901 has 2 divisors, whose sum is σ = 667267218902. Its totient is φ = 667267218900.

The previous prime is 667267218881. The next prime is 667267218911. The reversal of 667267218901 is 109812762766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657516643876 + 9750575025 = 810874^2 + 98745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667267218901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667267218911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333633609450 + 333633609451.

It is an arithmetic number, because the mean of its divisors is an integer number (333633609451).

Almost surely, 2^667267218901 is an apocalyptic number.

It is an amenable number.

667267218901 is a deficient number, since it is larger than the sum of its proper divisors (1).

667267218901 is an equidigital number, since it uses as much as digits as its factorization.

667267218901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 667267218901 in words is "six hundred sixty-seven billion, two hundred sixty-seven million, two hundred eighteen thousand, nine hundred one".