161481575767769 has 2 divisors, whose sum is σ = 161481575767770. Its totient is φ = 161481575767768.

The previous prime is 161481575767679. The next prime is 161481575767801. The reversal of 161481575767769 is 967767575184161.

Together with previous prime (161481575767679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110020967071744 + 51460608696025 = 10489088^2 + 7173605^2 .

It is a cyclic number.

It is not a de Polignac number, because 161481575767769 - 2²⁴ = 161481558990553 is a prime.

It is a super-2 number, since 2×161481575767769² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161481575767693 and 161481575767702.

It is not a weakly prime, because it can be changed into another prime (161481575767969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80740787883884 + 80740787883885.

It is an arithmetic number, because the mean of its divisors is an integer number (80740787883885).

Almost surely, 2^{161481575767769} is an apocalyptic number.

It is an amenable number.

161481575767769 is a deficient number, since it is larger than the sum of its proper divisors (1).

161481575767769 is an equidigital number, since it uses as much as digits as its factorization.

161481575767769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3734035200, while the sum is 80.

The spelling of 161481575767769 in words is "one hundred sixty-one trillion, four hundred eighty-one billion, five hundred seventy-five million, seven hundred sixty-seven thousand, seven hundred sixty-nine".