81071616630 has 32 divisors (see below), whose sum is σ = 194819169024. Its totient is φ = 21591621216.

The previous prime is 81071616607. The next prime is 81071616641. The reversal of 81071616630 is 3661617018.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1693282 + ... + 1740501.

It is an arithmetic number, because the mean of its divisors is an integer number (6088099032).

Almost surely, 2^81071616630 is an apocalyptic number.

81071616630 is an abundant number, since it is smaller than the sum of its proper divisors (113747552394).

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

81071616630 is a wasteful number, since it uses less digits than its factorization.

81071616630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3434580.

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 81071616630 in words is "eighty-one billion, seventy-one million, six hundred sixteen thousand, six hundred thirty".