81841459200 has 156 divisors (see below), whose sum is σ = 270590405808. Its totient is φ = 21824307200.

The previous prime is 81841459187. The next prime is 81841459223. The reversal of 81841459200 is 295414818.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173995 + ... + 440405.

Almost surely, 2^81841459200 is an apocalyptic number.

81841459200 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 81841459200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135295202904).

81841459200 is an abundant number, since it is smaller than the sum of its proper divisors (188748946608).

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

81841459200 is a wasteful number, since it uses less digits than its factorization.

81841459200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266448 (or 266421 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The spelling of 81841459200 in words is "eighty-one billion, eight hundred forty-one million, four hundred fifty-nine thousand, two hundred".