81360888960 has 256 divisors, whose sum is σ = 279730805760. Its totient is φ = 19995475968.

The previous prime is 81360888953. The next prime is 81360888979. The reversal of 81360888960 is 6988806318.

It is a super-2 number, since 2×81360888960² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81360888960.

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, 18293457 + ... + 18297903.

It is an arithmetic number, because the mean of its divisors is an integer number (1092698460).

Almost surely, 2^81360888960 is an apocalyptic number.

81360888960 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 81360888960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139865402880).

81360888960 is an abundant number, since it is smaller than the sum of its proper divisors (198369916800).

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

81360888960 is a wasteful number, since it uses less digits than its factorization.

81360888960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5215 (or 5203 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 57.

The spelling of 81360888960 in words is "eighty-one billion, three hundred sixty million, eight hundred eighty-eight thousand, nine hundred sixty".