81271418875 has 16 divisors (see below), whose sum is σ = 103584753792. Its totient is φ = 63633787200.

The previous prime is 81271418861. The next prime is 81271418929. The reversal of 81271418875 is 57881417218.

It is a happy number.

It is not a de Polignac number, because 81271418875 - 2⁹ = 81271418363 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6910842 + ... + 6922591.

It is an arithmetic number, because the mean of its divisors is an integer number (6474047112).

Almost surely, 2^81271418875 is an apocalyptic number.

81271418875 is a deficient number, since it is larger than the sum of its proper divisors (22313334917).

81271418875 is a wasteful number, since it uses less digits than its factorization.

81271418875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13833495 (or 13833485 counting only the distinct ones).

The product of its digits is 1003520, while the sum is 52.

The spelling of 81271418875 in words is "eighty-one billion, two hundred seventy-one million, four hundred eighteen thousand, eight hundred seventy-five".