81167565006 has 48 divisors (see below), whose sum is σ = 191909098368. Its totient is φ = 24588733200.

The previous prime is 81167564953. The next prime is 81167565053. The reversal of 81167565006 is 60056576118.

81167565006 is a `hidden beast` number, since 81 + 1 + 6 + 7 + 565 + 0 + 0 + 6 = 666.

It is a congruent number.

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, 606655 + ... + 728261.

It is an arithmetic number, because the mean of its divisors is an integer number (3998106216).

Almost surely, 2^81167565006 is an apocalyptic number.

81167565006 is an abundant number, since it is smaller than the sum of its proper divisors (110741533362).

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

81167565006 is a wasteful number, since it uses less digits than its factorization.

81167565006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124997 (or 124994 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 81167565006 in words is "eighty-one billion, one hundred sixty-seven million, five hundred sixty-five thousand, six".