66668133461 has 2 divisors, whose sum is σ = 66668133462. Its totient is φ = 66668133460.

The previous prime is 66668133421. The next prime is 66668133473. The reversal of 66668133461 is 16433186666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54170235025 + 12497898436 = 232745^2 + 111794^2 .

It is a cyclic number.

It is not a de Polignac number, because 66668133461 - 2¹⁸ = 66667871317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66668133421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33334066730 + 33334066731.

It is an arithmetic number, because the mean of its divisors is an integer number (33334066731).

Almost surely, 2^66668133461 is an apocalyptic number.

It is an amenable number.

66668133461 is a deficient number, since it is larger than the sum of its proper divisors (1).

66668133461 is an equidigital number, since it uses as much as digits as its factorization.

66668133461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 50.

The spelling of 66668133461 in words is "sixty-six billion, six hundred sixty-eight million, one hundred thirty-three thousand, four hundred sixty-one".