161487784161 has 32 divisors (see below), whose sum is σ = 272337776640. Its totient is φ = 93616102800.

The previous prime is 161487784153. The next prime is 161487784177.

161487784161 is a `hidden beast` number, since 1 + 61 + 487 + 7 + 8 + 41 + 61 = 666.

161487784161 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 161487784161 - 2³ = 161487784153 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161487784098 and 161487784107.

It is not an unprimeable number, because it can be changed into a prime (161487784111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11813385 + ... + 11827046.

It is an arithmetic number, because the mean of its divisors is an integer number (8510555520).

Almost surely, 2^161487784161 is an apocalyptic number.

161487784161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161487784161 is a deficient number, since it is larger than the sum of its proper divisors (110849992479).

161487784161 is a wasteful number, since it uses less digits than its factorization.

161487784161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23640474 (or 23640468 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The spelling of 161487784161 in words is "one hundred sixty-one billion, four hundred eighty-seven million, seven hundred eighty-four thousand, one hundred sixty-one".