161941354560 has 336 divisors, whose sum is σ = 584133441840. Its totient is φ = 41122529280.

The previous prime is 161941354529. The next prime is 161941354613. The reversal of 161941354560 is 65453149161.

161941354560 is a `hidden beast` number, since 1 + 6 + 1 + 9 + 41 + 3 + 545 + 60 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 4992270336 + 156949084224 = 70656^2 + 396168^2 .

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

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 47 ways as a sum of consecutive naturals, for example, 6083680 + ... + 6110240.

Almost surely, 2^161941354560 is an apocalyptic number.

161941354560 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 161941354560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292066720920).

161941354560 is an abundant number, since it is smaller than the sum of its proper divisors (422192087280).

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

161941354560 is a wasteful number, since it uses less digits than its factorization.

161941354560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26686 (or 26673 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 161941354560 in words is "one hundred sixty-one billion, nine hundred forty-one million, three hundred fifty-four thousand, five hundred sixty".