81467747471 has 32 divisors (see below), whose sum is σ = 95076495360. Its totient is φ = 69057964800.

The previous prime is 81467747447. The next prime is 81467747479. The reversal of 81467747471 is 17474776418.

It is not a de Polignac number, because 81467747471 - 2³⁴ = 64287878287 is a prime.

It is a super-3 number, since 3×81467747471³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81467747479) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 17559170 + ... + 17563808.

It is an arithmetic number, because the mean of its divisors is an integer number (2971140480).

Almost surely, 2^81467747471 is an apocalyptic number.

81467747471 is a deficient number, since it is larger than the sum of its proper divisors (13608747889).

81467747471 is a wasteful number, since it uses less digits than its factorization.

81467747471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6407.

The product of its digits is 7375872, while the sum is 56.

The spelling of 81467747471 in words is "eighty-one billion, four hundred sixty-seven million, seven hundred forty-seven thousand, four hundred seventy-one".