161203553612 has 24 divisors (see below), whose sum is σ = 291849922560. Its totient is φ = 77818164480.

The previous prime is 161203553579. The next prime is 161203553629. The reversal of 161203553612 is 216355302161.

161203553612 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3600548 + ... + 3645044.

It is an arithmetic number, because the mean of its divisors is an integer number (12160413440).

Almost surely, 2^161203553612 is an apocalyptic number.

It is an amenable number.

161203553612 is a deficient number, since it is larger than the sum of its proper divisors (130646368948).

161203553612 is a wasteful number, since it uses less digits than its factorization.

161203553612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75761 (or 75759 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

Adding to 161203553612 its reverse (216355302161), we get a palindrome (377558855773).

The spelling of 161203553612 in words is "one hundred sixty-one billion, two hundred three million, five hundred fifty-three thousand, six hundred twelve".