161786787687161 has 48 divisors (see below), whose sum is σ = 206011179315648. Its totient is φ = 125902150416000.

The previous prime is 161786787687137. The next prime is 161786787687163.

It is a happy number.

161786787687161 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-161786787687161 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161786787687163) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 836222486 + ... + 836415936.

It is an arithmetic number, because the mean of its divisors is an integer number (4291899569076).

Almost surely, 2^{161786787687161} is an apocalyptic number.

It is an amenable number.

161786787687161 is a deficient number, since it is larger than the sum of its proper divisors (44224391628487).

161786787687161 is a wasteful number, since it uses less digits than its factorization.

161786787687161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215062 (or 215055 counting only the distinct ones).

The product of its digits is 1593188352, while the sum is 80.

The spelling of 161786787687161 in words is "one hundred sixty-one trillion, seven hundred eighty-six billion, seven hundred eighty-seven million, six hundred eighty-seven thousand, one hundred sixty-one".