161763376861 has 4 divisors (see below), whose sum is σ = 161813046492. Its totient is φ = 161713707232.

The previous prime is 161763376849. The next prime is 161763376867. The reversal of 161763376861 is 168673367161.

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 107971388100 + 53791988761 = 328590^2 + 231931^2 .

It is a cyclic number.

It is not a de Polignac number, because 161763376861 - 2³⁵ = 127403638493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161763376867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24829930 + ... + 24836443.

It is an arithmetic number, because the mean of its divisors is an integer number (40453261623).

Almost surely, 2^161763376861 is an apocalyptic number.

It is an amenable number.

161763376861 is a deficient number, since it is larger than the sum of its proper divisors (49669631).

161763376861 is an equidigital number, since it uses as much as digits as its factorization.

161763376861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49669630.

The product of its digits is 4572288, while the sum is 55.

The spelling of 161763376861 in words is "one hundred sixty-one billion, seven hundred sixty-three million, three hundred seventy-six thousand, eight hundred sixty-one".