81553462327128 has 128 divisors (see below), whose sum is σ = 223424731296000. Its totient is φ = 24601396408320.

The previous prime is 81553462327037. The next prime is 81553462327159. The reversal of 81553462327128 is 82172326435518.

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, 537418368 + ... + 537570096.

It is an arithmetic number, because the mean of its divisors is an integer number (1745505713250).

Almost surely, 2^{81553462327128} is an apocalyptic number.

81553462327128 is a gapful number since it is divisible by the number (88) 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 81553462327128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111712365648000).

81553462327128 is an abundant number, since it is smaller than the sum of its proper divisors (141871268968872).

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

81553462327128 is a wasteful number, since it uses less digits than its factorization.

81553462327128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160945 (or 160941 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 57.

The spelling of 81553462327128 in words is "eighty-one trillion, five hundred fifty-three billion, four hundred sixty-two million, three hundred twenty-seven thousand, one hundred twenty-eight".