81347696433 has 24 divisors (see below), whose sum is σ = 123716704800. Its totient is φ = 51364969344.

The previous prime is 81347696411. The next prime is 81347696459. The reversal of 81347696433 is 33469674318.

It is a happy number.

81347696433 is a `hidden beast` number, since 8 + 134 + 76 + 9 + 6 + 433 = 666.

It is not a de Polignac number, because 81347696433 - 2⁵ = 81347696401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81347696433.

It is not an unprimeable number, because it can be changed into a prime (81347696933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 672441 + ... + 784137.

It is an arithmetic number, because the mean of its divisors is an integer number (5154862700).

Almost surely, 2^81347696433 is an apocalyptic number.

It is an amenable number.

81347696433 is a deficient number, since it is larger than the sum of its proper divisors (42369008367).

81347696433 is a wasteful number, since it uses less digits than its factorization.

81347696433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115981 (or 115978 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 54.

It can be divided in two parts, 813476 and 96433, that added together give a palindrome (909909).

The spelling of 81347696433 in words is "eighty-one billion, three hundred forty-seven million, six hundred ninety-six thousand, four hundred thirty-three".