161432550 has 144 divisors (see below), whose sum is σ = 464256000. Its totient is φ = 40098240.

The previous prime is 161432503. The next prime is 161432563. The reversal of 161432550 is 55234161.

161432550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 675331 + ... + 675569.

It is an arithmetic number, because the mean of its divisors is an integer number (3224000).

Almost surely, 2^161432550 is an apocalyptic number.

161432550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161432550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232128000).

161432550 is an abundant number, since it is smaller than the sum of its proper divisors (302823450).

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

161432550 is a wasteful number, since it uses less digits than its factorization.

161432550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 161432550 is about 12705.6109652389. The cubic root of 161432550 is about 544.4989362677.

The spelling of 161432550 in words is "one hundred sixty-one million, four hundred thirty-two thousand, five hundred fifty".