81240533407560 has 64 divisors (see below), whose sum is σ = 246658005074880. Its totient is φ = 21403128477440.

The previous prime is 81240533407543. The next prime is 81240533407567. The reversal of 81240533407560 is 6570433504218.

It is not an unprimeable number, because it can be changed into a prime (81240533407567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4078330071 + ... + 4078349990.

It is an arithmetic number, because the mean of its divisors is an integer number (3854031329295).

Almost surely, 2^{81240533407560} is an apocalyptic number.

It is an amenable number.

81240533407560 is an abundant number, since it is smaller than the sum of its proper divisors (165417471667320).

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

81240533407560 is a wasteful number, since it uses less digits than its factorization.

81240533407560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8156680158 (or 8156680154 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 48.

The spelling of 81240533407560 in words is "eighty-one trillion, two hundred forty billion, five hundred thirty-three million, four hundred seven thousand, five hundred sixty".