161841721684412 has 96 divisors (see below), whose sum is σ = 353416098309120. Its totient is φ = 63000432000000.

The previous prime is 161841721684411. The next prime is 161841721684421. The reversal of 161841721684412 is 214486127148161.

It is a happy number.

161841721684412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161841721684411) 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, 2522792537 + ... + 2522856687.

It is an arithmetic number, because the mean of its divisors is an integer number (3681417690720).

Almost surely, 2^{161841721684412} is an apocalyptic number.

It is an amenable number.

161841721684412 is an abundant number, since it is smaller than the sum of its proper divisors (191574376624708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161841721684412 is a wasteful number, since it uses less digits than its factorization.

161841721684412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71163 (or 71161 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 56.

The spelling of 161841721684412 in words is "one hundred sixty-one trillion, eight hundred forty-one billion, seven hundred twenty-one million, six hundred eighty-four thousand, four hundred twelve".