161295127811 has 4 divisors (see below), whose sum is σ = 166857028800. Its totient is φ = 155733226824.

The previous prime is 161295127783. The next prime is 161295127831. The reversal of 161295127811 is 118721592161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118721592161 = 9781 ⋅12137981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161295127811 is a prime.

It is a super-2 number, since 2×161295127811² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161295127831) 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 in 3 ways as a sum of consecutive naturals, for example, 2780950451 + ... + 2780950508.

It is an arithmetic number, because the mean of its divisors is an integer number (41714257200).

Almost surely, 2^161295127811 is an apocalyptic number.

161295127811 is a deficient number, since it is larger than the sum of its proper divisors (5561900989).

161295127811 is an equidigital number, since it uses as much as digits as its factorization.

161295127811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561900988.

The product of its digits is 60480, while the sum is 44.

The spelling of 161295127811 in words is "one hundred sixty-one billion, two hundred ninety-five million, one hundred twenty-seven thousand, eight hundred eleven".