81005500160 has 144 divisors (see below), whose sum is σ = 213407139456. Its totient is φ = 29273063424.

The previous prime is 81005500109. The next prime is 81005500171. The reversal of 81005500160 is 6100550018.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 730292 + ... + 833868.

It is an arithmetic number, because the mean of its divisors is an integer number (1481994024).

Almost surely, 2^81005500160 is an apocalyptic number.

81005500160 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 81005500160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106703569728).

81005500160 is an abundant number, since it is smaller than the sum of its proper divisors (132401639296).

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

81005500160 is a wasteful number, since it uses less digits than its factorization.

81005500160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103658 (or 103644 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The spelling of 81005500160 in words is "eighty-one billion, five million, five hundred thousand, one hundred sixty".