81120200160 has 192 divisors, whose sum is σ = 271093241664. Its totient is φ = 20319436800.

The previous prime is 81120200159. The next prime is 81120200209. The reversal of 81120200160 is 6100202118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4241820 + ... + 4260900.

It is an arithmetic number, because the mean of its divisors is an integer number (1411943967).

Almost surely, 2^81120200160 is an apocalyptic number.

81120200160 is a gapful number since it is divisible by the number (80) 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 81120200160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135546620832).

81120200160 is an abundant number, since it is smaller than the sum of its proper divisors (189973041504).

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

81120200160 is a wasteful number, since it uses less digits than its factorization.

81120200160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19637 (or 19629 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 81120200160 its reverse (6100202118), we get a palindrome (87220402278).

The spelling of 81120200160 in words is "eighty-one billion, one hundred twenty million, two hundred thousand, one hundred sixty".