81229275016 has 32 divisors (see below), whose sum is σ = 163535345280. Its totient is φ = 37687148800.

The previous prime is 81229274953. The next prime is 81229275031. The reversal of 81229275016 is 61057292218.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4196500 + ... + 4215811.

It is an arithmetic number, because the mean of its divisors is an integer number (5110479540).

Almost surely, 2^81229275016 is an apocalyptic number.

It is an amenable number.

81229275016 is an abundant number, since it is smaller than the sum of its proper divisors (82306070264).

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

81229275016 is a wasteful number, since it uses less digits than its factorization.

81229275016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8412405 (or 8412401 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 81229275016 in words is "eighty-one billion, two hundred twenty-nine million, two hundred seventy-five thousand, sixteen".