161125296961 has 2 divisors, whose sum is σ = 161125296962. Its totient is φ = 161125296960.

The previous prime is 161125296923. The next prime is 161125296973. The reversal of 161125296961 is 169692521161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95392028736 + 65733268225 = 308856^2 + 256385^2 .

It is a cyclic number.

It is not a de Polignac number, because 161125296961 - 2⁷ = 161125296833 is a prime.

It is a super-2 number, since 2×161125296961² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161125296901) 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, 80562648480 + 80562648481.

It is an arithmetic number, because the mean of its divisors is an integer number (80562648481).

Almost surely, 2^161125296961 is an apocalyptic number.

It is an amenable number.

161125296961 is a deficient number, since it is larger than the sum of its proper divisors (1).

161125296961 is an equidigital number, since it uses as much as digits as its factorization.

161125296961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 49.

The spelling of 161125296961 in words is "one hundred sixty-one billion, one hundred twenty-five million, two hundred ninety-six thousand, nine hundred sixty-one".