161546645161 has 24 divisors (see below), whose sum is σ = 192013355520. Its totient is φ = 135280759680.

The previous prime is 161546645147. The next prime is 161546645189.

It is a happy number.

161546645161 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 161546645161 - 2¹⁵ = 161546612393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161546645191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 738801 + ... + 932158.

It is an arithmetic number, because the mean of its divisors is an integer number (8000556480).

Almost surely, 2^161546645161 is an apocalyptic number.

161546645161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161546645161 is a deficient number, since it is larger than the sum of its proper divisors (30466710359).

161546645161 is a wasteful number, since it uses less digits than its factorization.

161546645161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671045 (or 1671034 counting only the distinct ones).

The product of its digits is 518400, while the sum is 46.

The spelling of 161546645161 in words is "one hundred sixty-one billion, five hundred forty-six million, six hundred forty-five thousand, one hundred sixty-one".