133368135661 has 2 divisors, whose sum is σ = 133368135662. Its totient is φ = 133368135660.

The previous prime is 133368135541. The next prime is 133368135673. The reversal of 133368135661 is 166531863331.

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., 87408922500 + 45959213161 = 295650^2 + 214381^2 .

It is a cyclic number.

It is not a de Polignac number, because 133368135661 - 2⁷ = 133368135533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133368135161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66684067830 + 66684067831.

It is an arithmetic number, because the mean of its divisors is an integer number (66684067831).

Almost surely, 2^133368135661 is an apocalyptic number.

It is an amenable number.

133368135661 is a deficient number, since it is larger than the sum of its proper divisors (1).

133368135661 is an equidigital number, since it uses as much as digits as its factorization.

133368135661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 46.

Adding to 133368135661 its reverse (166531863331), we get a palindrome (299899998992).

The spelling of 133368135661 in words is "one hundred thirty-three billion, three hundred sixty-eight million, one hundred thirty-five thousand, six hundred sixty-one".