121670561829581 has 2 divisors, whose sum is σ = 121670561829582. Its totient is φ = 121670561829580.

The previous prime is 121670561829569. The next prime is 121670561829617. The reversal of 121670561829581 is 185928165076121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97208931772681 + 24461630056900 = 9859459^2 + 4945870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121670561829581 is a prime.

It is a super-2 number, since 2×121670561829581² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121670561829881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60835280914790 + 60835280914791.

It is an arithmetic number, because the mean of its divisors is an integer number (60835280914791).

Almost surely, 2^{121670561829581} is an apocalyptic number.

It is an amenable number.

121670561829581 is a deficient number, since it is larger than the sum of its proper divisors (1).

121670561829581 is an equidigital number, since it uses as much as digits as its factorization.

121670561829581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14515200, while the sum is 62.

The spelling of 121670561829581 in words is "one hundred twenty-one trillion, six hundred seventy billion, five hundred sixty-one million, eight hundred twenty-nine thousand, five hundred eighty-one".