161204935612 has 54 divisors (see below), whose sum is σ = 337139356568. Its totient is φ = 66063979344.

The previous prime is 161204935561. The next prime is 161204935651. The reversal of 161204935612 is 216539402161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48863139 + ... + 48866437.

Almost surely, 2^161204935612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161204935612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168569678284).

161204935612 is an abundant number, since it is smaller than the sum of its proper divisors (175934420956).

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

161204935612 is an frugal number, since it uses more digits than its factorization.

161204935612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6655 (or 3331 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 161204935612 in words is "one hundred sixty-one billion, two hundred four million, nine hundred thirty-five thousand, six hundred twelve".