81475200000 has 1056 divisors, whose sum is σ = 322381866240. Its totient is φ = 20275200000.

The previous prime is 81475199989. The next prime is 81475200047. The reversal of 81475200000 is 257418.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1987199980 + ... + 1987200020.

Almost surely, 2^81475200000 is an apocalyptic number.

81475200000 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 81475200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161190933120).

81475200000 is an abundant number, since it is smaller than the sum of its proper divisors (240906666240).

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

81475200000 is an equidigital number, since it uses as much as digits as its factorization.

81475200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

Adding to 81475200000 its reverse (257418), we get a palindrome (81475457418).

The spelling of 81475200000 in words is "eighty-one billion, four hundred seventy-five million, two hundred thousand".