81570808080000 has 320 divisors, whose sum is σ = 300837679876800. Its totient is φ = 21752214912000.

The previous prime is 81570808079903. The next prime is 81570808080001. The reversal of 81570808080000 is 8080807518.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (81570808080001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16722132 + ... + 21042131.

It is an arithmetic number, because the mean of its divisors is an integer number (940117749615).

Almost surely, 2^{81570808080000} is an apocalyptic number.

81570808080000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81570808080000 is an abundant number, since it is smaller than the sum of its proper divisors (219266871796800).

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

81570808080000 is an equidigital number, since it uses as much as digits as its factorization.

81570808080000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37764306 (or 37764273 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

Adding to 81570808080000 its reverse (8080807518), we get a palindrome (81578888887518).

The spelling of 81570808080000 in words is "eighty-one trillion, five hundred seventy billion, eight hundred eight million, eighty thousand".