161843254272 has 264 divisors, whose sum is σ = 535088027136. Its totient is φ = 46153580544.

The previous prime is 161843254241. The next prime is 161843254289. The reversal of 161843254272 is 272452348161.

161843254272 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 4 + 32 + 542 + 72 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39156718 + ... + 39160850.

Almost surely, 2^161843254272 is an apocalyptic number.

161843254272 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 161843254272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267544013568).

161843254272 is an abundant number, since it is smaller than the sum of its proper divisors (373244772864).

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

161843254272 is a wasteful number, since it uses less digits than its factorization.

161843254272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773 (or 4752 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The spelling of 161843254272 in words is "one hundred sixty-one billion, eight hundred forty-three million, two hundred fifty-four thousand, two hundred seventy-two".