83561216538 has 8 divisors (see below), whose sum is σ = 167122433088. Its totient is φ = 27853738844.

The previous prime is 83561216483. The next prime is 83561216539.

83561216538 is nontrivially palindromic in base 10.

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

83561216538 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (83561216539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6963434706 + ... + 6963434717.

It is an arithmetic number, because the mean of its divisors is an integer number (20890304136).

Almost surely, 2^83561216538 is an apocalyptic number.

83561216538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

83561216538 is a wasteful number, since it uses less digits than its factorization.

83561216538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13926869428.

The product of its digits is 1036800, while the sum is 48.

The spelling of 83561216538 in words is "eighty-three billion, five hundred sixty-one million, two hundred sixteen thousand, five hundred thirty-eight".