81623888547 has 8 divisors (see below), whose sum is σ = 108834907920. Its totient is φ = 54414397440.

The previous prime is 81623888477. The next prime is 81623888623. The reversal of 81623888547 is 74588832618.

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

It is not a de Polignac number, because 81623888547 - 2¹⁰ = 81623887523 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81623888347) 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, 251022 + ... + 475667.

It is an arithmetic number, because the mean of its divisors is an integer number (13604363490).

Almost surely, 2^81623888547 is an apocalyptic number.

81623888547 is a deficient number, since it is larger than the sum of its proper divisors (27211019373).

81623888547 is a wasteful number, since it uses less digits than its factorization.

81623888547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764133.

The product of its digits is 20643840, while the sum is 60.

The spelling of 81623888547 in words is "eighty-one billion, six hundred twenty-three million, eight hundred eighty-eight thousand, five hundred forty-seven".