133551116681 has 2 divisors, whose sum is σ = 133551116682. Its totient is φ = 133551116680.

The previous prime is 133551116627. The next prime is 133551116701. The reversal of 133551116681 is 186611155331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101579888656 + 31971228025 = 318716^2 + 178805^2 .

It is an emirp because it is prime and its reverse (186611155331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133551116681 is a prime.

It is a super-2 number, since 2×133551116681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (133551106681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66775558340 + 66775558341.

It is an arithmetic number, because the mean of its divisors is an integer number (66775558341).

Almost surely, 2^133551116681 is an apocalyptic number.

It is an amenable number.

133551116681 is a deficient number, since it is larger than the sum of its proper divisors (1).

133551116681 is an equidigital number, since it uses as much as digits as its factorization.

133551116681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The spelling of 133551116681 in words is "one hundred thirty-three billion, five hundred fifty-one million, one hundred sixteen thousand, six hundred eighty-one".