161550109440 has 216 divisors, whose sum is σ = 560260628928. Its totient is φ = 42978754560.

The previous prime is 161550109439. The next prime is 161550109451. The reversal of 161550109440 is 44901055161.

161550109440 is a `hidden beast` number, since 1 + 6 + 1 + 550 + 10 + 94 + 4 + 0 = 666.

It is a super-2 number, since 2×161550109440² (a number of 23 digits) contains 22 as substring.

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 = 161550109395 and 161550109404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4948852 + ... + 4981388.

It is an arithmetic number, because the mean of its divisors is an integer number (2593799208).

Almost surely, 2^161550109440 is an apocalyptic number.

161550109440 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 161550109440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280130314464).

161550109440 is an abundant number, since it is smaller than the sum of its proper divisors (398710519488).

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

161550109440 is a wasteful number, since it uses less digits than its factorization.

161550109440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32995 (or 32978 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 161550109440 in words is "one hundred sixty-one billion, five hundred fifty million, one hundred nine thousand, four hundred forty".