161896044240 has 480 divisors, whose sum is σ = 679158245376. Its totient is φ = 33704017920.

The previous prime is 161896044229. The next prime is 161896044259. The reversal of 161896044240 is 42440698161.

161896044240 is a `hidden beast` number, since 1 + 6 + 18 + 9 + 604 + 4 + 24 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2625604 + ... + 2686556.

Almost surely, 2^161896044240 is an apocalyptic number.

161896044240 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 161896044240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339579122688).

161896044240 is an abundant number, since it is smaller than the sum of its proper divisors (517262201136).

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

161896044240 is a wasteful number, since it uses less digits than its factorization.

161896044240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61027 (or 61018 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 161896044240 in words is "one hundred sixty-one billion, eight hundred ninety-six million, forty-four thousand, two hundred forty".