161555046912 has 480 divisors, whose sum is σ = 561846789504. Its totient is φ = 45386956800.

The previous prime is 161555046911. The next prime is 161555046929. The reversal of 161555046912 is 219640555161.

161555046912 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 550 + 4 + 6 + 91 + 2 = 666.

It is a super-2 number, since 2×161555046912² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161555046911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53124112 + ... + 53127152.

Almost surely, 2^161555046912 is an apocalyptic number.

161555046912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161555046912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280923394752).

161555046912 is an abundant number, since it is smaller than the sum of its proper divisors (400291742592).

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

161555046912 is an frugal number, since it uses more digits than its factorization.

161555046912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142 (or 3114 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 161555046912 in words is "one hundred sixty-one billion, five hundred fifty-five million, forty-six thousand, nine hundred twelve".