81772342547 has 8 divisors (see below), whose sum is σ = 93666988800. Its totient is φ = 69930917064.

The previous prime is 81772342489. The next prime is 81772342559. The reversal of 81772342547 is 74524327718.

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-81772342547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81772342495 and 81772342504.

It is not an unprimeable number, because it can be changed into a prime (81772344547) 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, 13301897 + ... + 13308042.

It is an arithmetic number, because the mean of its divisors is an integer number (11708373600).

Almost surely, 2^81772342547 is an apocalyptic number.

81772342547 is a deficient number, since it is larger than the sum of its proper divisors (11894646253).

81772342547 is a wasteful number, since it uses less digits than its factorization.

81772342547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26610385.

The product of its digits is 2634240, while the sum is 50.

The spelling of 81772342547 in words is "eighty-one billion, seven hundred seventy-two million, three hundred forty-two thousand, five hundred forty-seven".