161955480 has 64 divisors (see below), whose sum is σ = 489738240. Its totient is φ = 42844032.

The previous prime is 161955463. The next prime is 161955499. The reversal of 161955480 is 84559161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9927 + ... + 20553.

It is an arithmetic number, because the mean of its divisors is an integer number (7652160).

Almost surely, 2^161955480 is an apocalyptic number.

161955480 is a gapful number since it is divisible by the number (10) 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 161955480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244869120).

161955480 is an abundant number, since it is smaller than the sum of its proper divisors (327782760).

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

161955480 is a wasteful number, since it uses less digits than its factorization.

161955480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10768 (or 10764 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 161955480 is about 12726.1730304126. The cubic root of 161955480 is about 545.0862361085.

The spelling of 161955480 in words is "one hundred sixty-one million, nine hundred fifty-five thousand, four hundred eighty".