161427771232 has 192 divisors, whose sum is σ = 402397922304. Its totient is φ = 62031329280.

The previous prime is 161427771223. The next prime is 161427771247. The reversal of 161427771232 is 232177724161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104618653 + ... + 104620195.

It is an arithmetic number, because the mean of its divisors is an integer number (2095822512).

Almost surely, 2^161427771232 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 161427771232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201198961152).

161427771232 is an abundant number, since it is smaller than the sum of its proper divisors (240970151072).

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

161427771232 is a wasteful number, since it uses less digits than its factorization.

161427771232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581 (or 2573 counting only the distinct ones).

The product of its digits is 197568, while the sum is 43.

The spelling of 161427771232 in words is "one hundred sixty-one billion, four hundred twenty-seven million, seven hundred seventy-one thousand, two hundred thirty-two".