161366280 has 64 divisors (see below), whose sum is σ = 486034560. Its totient is φ = 42859008.

The previous prime is 161366279. The next prime is 161366299. The reversal of 161366280 is 82663161.

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, 29004 + ... + 34116.

It is an arithmetic number, because the mean of its divisors is an integer number (7594290).

Almost surely, 2^161366280 is an apocalyptic number.

161366280 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 161366280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243017280).

161366280 is an abundant number, since it is smaller than the sum of its proper divisors (324668280).

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

161366280 is a wasteful number, since it uses less digits than its factorization.

161366280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5390 (or 5386 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 161366280 is about 12703.0027946151. The cubic root of 161366280 is about 544.4244182863.

The spelling of 161366280 in words is "one hundred sixty-one million, three hundred sixty-six thousand, two hundred eighty".