81228825815600 has 60 divisors (see below), whose sum is σ = 195741838190040. Its totient is φ = 32393368550400.

The previous prime is 81228825815593. The next prime is 81228825815603. The reversal of 81228825815600 is 651852882218.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81228825815603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 306622985 + ... + 306887784.

It is an arithmetic number, because the mean of its divisors is an integer number (3262363969834).

Almost surely, 2^{81228825815600} is an apocalyptic number.

81228825815600 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81228825815600 is an abundant number, since it is smaller than the sum of its proper divisors (114513012374440).

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

81228825815600 is a wasteful number, since it uses less digits than its factorization.

81228825815600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613511118 (or 613511107 counting only the distinct ones).

The product of its (nonzero) digits is 4915200, while the sum is 56.

The spelling of 81228825815600 in words is "eighty-one trillion, two hundred twenty-eight billion, eight hundred twenty-five million, eight hundred fifteen thousand, six hundred".