161911650240 has 672 divisors, whose sum is σ = 612295407360. Its totient is φ = 39105331200.

The previous prime is 161911650211. The next prime is 161911650253. The reversal of 161911650240 is 42056119161.

161911650240 is a `hidden beast` number, since 1 + 61 + 91 + 1 + 6 + 502 + 4 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 161911650195 and 161911650204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 158580930 + ... + 158581950.

It is an arithmetic number, because the mean of its divisors is an integer number (911153880).

Almost surely, 2^161911650240 is an apocalyptic number.

161911650240 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 161911650240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306147703680).

161911650240 is an abundant number, since it is smaller than the sum of its proper divisors (450383757120).

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

161911650240 is a wasteful number, since it uses less digits than its factorization.

161911650240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181 (or 1168 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 161911650240 in words is "one hundred sixty-one billion, nine hundred eleven million, six hundred fifty thousand, two hundred forty".