81225002496 has 160 divisors (see below), whose sum is σ = 236386263168. Its totient is φ = 24579645440.

The previous prime is 81225002473. The next prime is 81225002503. The reversal of 81225002496 is 69420052218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13970086 + ... + 13975898.

Almost surely, 2^81225002496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81225002496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118193131584).

81225002496 is an abundant number, since it is smaller than the sum of its proper divisors (155161260672).

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

81225002496 is a wasteful number, since it uses less digits than its factorization.

81225002496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6672 (or 6656 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 81225002496 in words is "eighty-one billion, two hundred twenty-five million, two thousand, four hundred ninety-six".