161731775763 has 8 divisors (see below), whose sum is σ = 239602630800. Its totient is φ = 107821183824.

The previous prime is 161731775759. The next prime is 161731775783. The reversal of 161731775763 is 367577137161.

161731775763 is a `hidden beast` number, since 1 + 61 + 7 + 3 + 1 + 7 + 7 + 576 + 3 = 666.

It is not a de Polignac number, because 161731775763 - 2² = 161731775759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161731775783) 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, 2995032858 + ... + 2995032911.

It is an arithmetic number, because the mean of its divisors is an integer number (29950328850).

Almost surely, 2^161731775763 is an apocalyptic number.

161731775763 is a deficient number, since it is larger than the sum of its proper divisors (77870855037).

161731775763 is an equidigital number, since it uses as much as digits as its factorization.

161731775763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5990065778 (or 5990065772 counting only the distinct ones).

The product of its digits is 3889620, while the sum is 54.

The spelling of 161731775763 in words is "one hundred sixty-one billion, seven hundred thirty-one million, seven hundred seventy-five thousand, seven hundred sixty-three".