161156124446761 has 2 divisors, whose sum is σ = 161156124446762. Its totient is φ = 161156124446760.

The previous prime is 161156124446693. The next prime is 161156124446771. The reversal of 161156124446761 is 167644421651161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159703752386025 + 1452372060736 = 12637395^2 + 1205144^2 .

It is a cyclic number.

It is not a de Polignac number, because 161156124446761 - 2⁹ = 161156124446249 is a prime.

It is a super-2 number, since 2×161156124446761² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161156124446771) 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, 80578062223380 + 80578062223381.

It is an arithmetic number, because the mean of its divisors is an integer number (80578062223381).

Almost surely, 2^{161156124446761} is an apocalyptic number.

It is an amenable number.

161156124446761 is a deficient number, since it is larger than the sum of its proper divisors (1).

161156124446761 is an equidigital number, since it uses as much as digits as its factorization.

161156124446761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 55.

The spelling of 161156124446761 in words is "one hundred sixty-one trillion, one hundred fifty-six billion, one hundred twenty-four million, four hundred forty-six thousand, seven hundred sixty-one".