161611101649993 has 2 divisors, whose sum is σ = 161611101649994. Its totient is φ = 161611101649992.

The previous prime is 161611101649961. The next prime is 161611101650083. The reversal of 161611101649993 is 399946101116161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134066942097984 + 27544159552009 = 11578728^2 + 5248253^2 .

It is a cyclic number.

It is not a de Polignac number, because 161611101649993 - 2⁵ = 161611101649961 is a prime.

It is a super-2 number, since 2×161611101649993² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161611108649993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80805550824996 + 80805550824997.

It is an arithmetic number, because the mean of its divisors is an integer number (80805550824997).

Almost surely, 2^{161611101649993} is an apocalyptic number.

It is an amenable number.

161611101649993 is a deficient number, since it is larger than the sum of its proper divisors (1).

161611101649993 is an equidigital number, since it uses as much as digits as its factorization.

161611101649993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1889568, while the sum is 58.

The spelling of 161611101649993 in words is "one hundred sixty-one trillion, six hundred eleven billion, one hundred one million, six hundred forty-nine thousand, nine hundred ninety-three".