29685688842181 has 2 divisors, whose sum is σ = 29685688842182. Its totient is φ = 29685688842180.

The previous prime is 29685688842163. The next prime is 29685688842241. The reversal of 29685688842181 is 18124888658692.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29639760066081 + 45928776100 = 5444241^2 + 214310^2 .

It is a cyclic number.

It is not a de Polignac number, because 29685688842181 - 2¹³ = 29685688833989 is a prime.

It is a super-2 number, since 2×29685688842181² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 29685688842098 and 29685688842107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29685688842101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14842844421090 + 14842844421091.

It is an arithmetic number, because the mean of its divisors is an integer number (14842844421091).

Almost surely, 2^{29685688842181} is an apocalyptic number.

It is an amenable number.

29685688842181 is a deficient number, since it is larger than the sum of its proper divisors (1).

29685688842181 is an equidigital number, since it uses as much as digits as its factorization.

29685688842181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 849346560, while the sum is 76.

The spelling of 29685688842181 in words is "twenty-nine trillion, six hundred eighty-five billion, six hundred eighty-eight million, eight hundred forty-two thousand, one hundred eighty-one".