161122771081 has 8 divisors (see below), whose sum is σ = 161846324640. Its totient is φ = 160400670528.

The previous prime is 161122771057. The next prime is 161122771091. The reversal of 161122771081 is 180177221161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161122771081 - 2²⁹ = 160585900169 is a prime.

It is a super-2 number, since 2×161122771081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161122771081.

It is not an unprimeable number, because it can be changed into a prime (161122771091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140671 + ... + 584836.

It is an arithmetic number, because the mean of its divisors is an integer number (20230790580).

Almost surely, 2^161122771081 is an apocalyptic number.

It is an amenable number.

161122771081 is a deficient number, since it is larger than the sum of its proper divisors (723553559).

161122771081 is an equidigital number, since it uses as much as digits as its factorization.

161122771081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726503.

The product of its (nonzero) digits is 9408, while the sum is 37.

The spelling of 161122771081 in words is "one hundred sixty-one billion, one hundred twenty-two million, seven hundred seventy-one thousand, eighty-one".