81509660286 has 16 divisors (see below), whose sum is σ = 163160967168. Its totient is φ = 27146279000.

The previous prime is 81509660273. The next prime is 81509660321. The reversal of 81509660286 is 68206690518.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5894460 + ... + 5908271.

It is an arithmetic number, because the mean of its divisors is an integer number (10197560448).

Almost surely, 2^81509660286 is an apocalyptic number.

81509660286 is an abundant number, since it is smaller than the sum of its proper divisors (81651306882).

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

81509660286 is a wasteful number, since it uses less digits than its factorization.

81509660286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11803887.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 81509660286 in words is "eighty-one billion, five hundred nine million, six hundred sixty thousand, two hundred eighty-six".