161233515644 has 12 divisors (see below), whose sum is σ = 282284688000. Its totient is φ = 80580747648.

The previous prime is 161233515643. The next prime is 161233515659. The reversal of 161233515644 is 446515332161.

161233515644 is digitally balanced in base 3, 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 (161233515643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8992469 + ... + 9010380.

It is an arithmetic number, because the mean of its divisors is an integer number (23523724000).

Almost surely, 2^161233515644 is an apocalyptic number.

It is an amenable number.

161233515644 is a deficient number, since it is larger than the sum of its proper divisors (121051172356).

161233515644 is a wasteful number, since it uses less digits than its factorization.

161233515644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18005092 (or 18005090 counting only the distinct ones).

The product of its digits is 259200, while the sum is 41.

The spelling of 161233515644 in words is "one hundred sixty-one billion, two hundred thirty-three million, five hundred fifteen thousand, six hundred forty-four".