81017080506 has 48 divisors (see below), whose sum is σ = 185885668800. Its totient is φ = 25413984384.

The previous prime is 81017080481. The next prime is 81017080517. The reversal of 81017080506 is 60508071018.

81017080506 is a `hidden beast` number, since 8 + 1 + 0 + 1 + 70 + 80 + 506 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4507285 + ... + 4525223.

It is an arithmetic number, because the mean of its divisors is an integer number (3872618100).

Almost surely, 2^81017080506 is an apocalyptic number.

81017080506 is an abundant number, since it is smaller than the sum of its proper divisors (104868588294).

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

81017080506 is a wasteful number, since it uses less digits than its factorization.

81017080506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32723 (or 32720 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The spelling of 81017080506 in words is "eighty-one billion, seventeen million, eighty thousand, five hundred six".