161122562609 has 2 divisors, whose sum is σ = 161122562610. Its totient is φ = 161122562608.

The previous prime is 161122562599. The next prime is 161122562633. The reversal of 161122562609 is 906265221161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132933160000 + 28189402609 = 364600^2 + 167897^2 .

It is a cyclic number.

It is not a de Polignac number, because 161122562609 - 2²⁸ = 160854127153 is a prime.

It is a super-2 number, since 2×161122562609² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161122562509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80561281304 + 80561281305.

It is an arithmetic number, because the mean of its divisors is an integer number (80561281305).

Almost surely, 2^161122562609 is an apocalyptic number.

It is an amenable number.

161122562609 is a deficient number, since it is larger than the sum of its proper divisors (1).

161122562609 is an equidigital number, since it uses as much as digits as its factorization.

161122562609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 161122562609 in words is "one hundred sixty-one billion, one hundred twenty-two million, five hundred sixty-two thousand, six hundred nine".