81067991016 has 32 divisors (see below), whose sum is σ = 203578824960. Its totient is φ = 26901484032.

The previous prime is 81067990987. The next prime is 81067991027. The reversal of 81067991016 is 61019976018.

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, 7568265 + ... + 7578968.

It is an arithmetic number, because the mean of its divisors is an integer number (6361838280).

Almost surely, 2^81067991016 is an apocalyptic number.

It is an amenable number.

81067991016 is an abundant number, since it is smaller than the sum of its proper divisors (122510833944).

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

81067991016 is a wasteful number, since it uses less digits than its factorization.

81067991016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15147465 (or 15147461 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 48.

The spelling of 81067991016 in words is "eighty-one billion, sixty-seven million, nine hundred ninety-one thousand, sixteen".