161201102112 has 72 divisors (see below), whose sum is σ = 473203261440. Its totient is φ = 52000352640.

The previous prime is 161201102063. The next prime is 161201102113. The reversal of 161201102112 is 211201102161.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (161201102113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9018912 + ... + 9036767.

It is an arithmetic number, because the mean of its divisors is an integer number (6572267520).

Almost surely, 2^161201102112 is an apocalyptic number.

161201102112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161201102112 is an abundant number, since it is smaller than the sum of its proper divisors (312002159328).

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

161201102112 is a wasteful number, since it uses less digits than its factorization.

161201102112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18055726 (or 18055715 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 161201102112 its reverse (211201102161), we get a palindrome (372402204273).

The spelling of 161201102112 in words is "one hundred sixty-one billion, two hundred one million, one hundred two thousand, one hundred twelve".