81325834547 has 8 divisors (see below), whose sum is σ = 81422016480. Its totient is φ = 81229696000.

The previous prime is 81325834477. The next prime is 81325834631. The reversal of 81325834547 is 74543852318.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81325834547 is a prime.

It is a super-2 number, since 2×81325834547² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81325834495 and 81325834504.

It is not an unprimeable number, because it can be changed into a prime (81325834747) 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, 5074547 + ... + 5090547.

It is an arithmetic number, because the mean of its divisors is an integer number (10177752060).

Almost surely, 2^81325834547 is an apocalyptic number.

81325834547 is a deficient number, since it is larger than the sum of its proper divisors (96181933).

81325834547 is a wasteful number, since it uses less digits than its factorization.

81325834547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21693.

The product of its digits is 3225600, while the sum is 50.

The spelling of 81325834547 in words is "eighty-one billion, three hundred twenty-five million, eight hundred thirty-four thousand, five hundred forty-seven".