161481389680 has 160 divisors (see below), whose sum is σ = 415064684160. Its totient is φ = 58046300160.

The previous prime is 161481389677. The next prime is 161481389681. The reversal of 161481389680 is 86983184161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161481389681) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 21444156 + ... + 21451684.

It is an arithmetic number, because the mean of its divisors is an integer number (2594154276).

Almost surely, 2^161481389680 is an apocalyptic number.

161481389680 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 161481389680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207532342080).

161481389680 is an abundant number, since it is smaller than the sum of its proper divisors (253583294480).

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

161481389680 is a wasteful number, since it uses less digits than its factorization.

161481389680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8099 (or 8093 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 55.

The spelling of 161481389680 in words is "one hundred sixty-one billion, four hundred eighty-one million, three hundred eighty-nine thousand, six hundred eighty".