161162773491113 has 4 divisors (see below), whose sum is σ = 161162901796308. Its totient is φ = 161162645185920.

The previous prime is 161162773491089. The next prime is 161162773491121. The reversal of 161162773491113 is 311194377261161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111171043637824 + 49991729853289 = 10543768^2 + 7070483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161162773491113 is a prime.

It is a super-2 number, since 2×161162773491113² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161162773490113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62249648 + ... + 64786913.

It is an arithmetic number, because the mean of its divisors is an integer number (40290725449077).

Almost surely, 2^{161162773491113} is an apocalyptic number.

It is an amenable number.

161162773491113 is a deficient number, since it is larger than the sum of its proper divisors (128305195).

161162773491113 is a wasteful number, since it uses less digits than its factorization.

161162773491113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128305194.

The product of its digits is 1143072, while the sum is 53.

The spelling of 161162773491113 in words is "one hundred sixty-one trillion, one hundred sixty-two billion, seven hundred seventy-three million, four hundred ninety-one thousand, one hundred thirteen".