133666210859491 has 2 divisors, whose sum is σ = 133666210859492. Its totient is φ = 133666210859490.

The previous prime is 133666210859459. The next prime is 133666210859513. The reversal of 133666210859491 is 194958012666331.

It is a strong prime.

It is an emirp because it is prime and its reverse (194958012666331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133666210859491 - 2⁵ = 133666210859459 is a prime.

It is not a weakly prime, because it can be changed into another prime (133666210809491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66833105429745 + 66833105429746.

It is an arithmetic number, because the mean of its divisors is an integer number (66833105429746).

Almost surely, 2^{133666210859491} is an apocalyptic number.

133666210859491 is a deficient number, since it is larger than the sum of its proper divisors (1).

133666210859491 is an equidigital number, since it uses as much as digits as its factorization.

133666210859491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50388480, while the sum is 64.

The spelling of 133666210859491 in words is "one hundred thirty-three trillion, six hundred sixty-six billion, two hundred ten million, eight hundred fifty-nine thousand, four hundred ninety-one".