81486025520 has 80 divisors (see below), whose sum is σ = 190599363360. Its totient is φ = 32398080000.

The previous prime is 81486025513. The next prime is 81486025529. The reversal of 81486025520 is 2552068418.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (81486025529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10457786 + ... + 10465574.

It is an arithmetic number, because the mean of its divisors is an integer number (2382492042).

Almost surely, 2^81486025520 is an apocalyptic number.

81486025520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81486025520 is an abundant number, since it is smaller than the sum of its proper divisors (109113337840).

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

81486025520 is a wasteful number, since it uses less digits than its factorization.

81486025520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8574 (or 8568 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 41.

The spelling of 81486025520 in words is "eighty-one billion, four hundred eighty-six million, twenty-five thousand, five hundred twenty".