161143776 has 96 divisors (see below), whose sum is σ = 481572000. Its totient is φ = 52392960.

The previous prime is 161143771. The next prime is 161143789. The reversal of 161143776 is 677341161.

161143776 is a `hidden beast` number, since 1 + 611 + 4 + 37 + 7 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161143776.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161143771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33150 + ... + 37698.

It is an arithmetic number, because the mean of its divisors is an integer number (5016375).

Almost surely, 2^161143776 is an apocalyptic number.

161143776 is a gapful number since it is divisible by the number (16) 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 161143776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240786000).

161143776 is an abundant number, since it is smaller than the sum of its proper divisors (320428224).

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

161143776 is a wasteful number, since it uses less digits than its factorization.

161143776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4609 (or 4595 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 161143776 is about 12694.2418442379. The cubic root of 161143776 is about 544.1740720329.

The spelling of 161143776 in words is "one hundred sixty-one million, one hundred forty-three thousand, seven hundred seventy-six".