81634415043 has 18 divisors (see below), whose sum is σ = 109412980876. Its totient is φ = 54140863472.

The previous prime is 81634415029. The next prime is 81634415063. The reversal of 81634415043 is 34051443618.

It is a happy number.

It is not a de Polignac number, because 81634415043 - 2⁹ = 81634414531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81634414992 and 81634415010.

It is not an unprimeable number, because it can be changed into a prime (81634415063) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 144998680 + ... + 144999242.

Almost surely, 2^81634415043 is an apocalyptic number.

81634415043 is a deficient number, since it is larger than the sum of its proper divisors (27778565833).

81634415043 is an frugal number, since it uses more digits than its factorization.

81634415043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 81634415043 in words is "eighty-one billion, six hundred thirty-four million, four hundred fifteen thousand, forty-three".