81047433813 has 8 divisors (see below), whose sum is σ = 111789564000. Its totient is φ = 52168463088.

The previous prime is 81047433811. The next prime is 81047433869. The reversal of 81047433813 is 31833474018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81047433813 - 2¹ = 81047433811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81047433811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465789763 + ... + 465789936.

It is an arithmetic number, because the mean of its divisors is an integer number (13973695500).

Almost surely, 2^81047433813 is an apocalyptic number.

It is an amenable number.

81047433813 is a deficient number, since it is larger than the sum of its proper divisors (30742130187).

81047433813 is a wasteful number, since it uses less digits than its factorization.

81047433813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931579731.

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 81047433813 in words is "eighty-one billion, forty-seven million, four hundred thirty-three thousand, eight hundred thirteen".