133605666451 has 2 divisors, whose sum is σ = 133605666452. Its totient is φ = 133605666450.

The previous prime is 133605666421. The next prime is 133605666473. The reversal of 133605666451 is 154666506331.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133605666451 - 2⁵ = 133605666419 is a prime.

It is not a weakly prime, because it can be changed into another prime (133605666421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66802833225 + 66802833226.

It is an arithmetic number, because the mean of its divisors is an integer number (66802833226).

Almost surely, 2^133605666451 is an apocalyptic number.

133605666451 is a deficient number, since it is larger than the sum of its proper divisors (1).

133605666451 is an equidigital number, since it uses as much as digits as its factorization.

133605666451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 133605666451 in words is "one hundred thirty-three billion, six hundred five million, six hundred sixty-six thousand, four hundred fifty-one".