82561604543 has 16 divisors (see below), whose sum is σ = 91063491840. Its totient is φ = 74230152000.

The previous prime is 82561604527. The next prime is 82561604551. The reversal of 82561604543 is 34540616528.

It is a cyclic number.

It is not a de Polignac number, because 82561604543 - 2⁴ = 82561604527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82561604494 and 82561604503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82561604443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267563 + ... + 486531.

It is an arithmetic number, because the mean of its divisors is an integer number (5691468240).

Almost surely, 2^82561604543 is an apocalyptic number.

82561604543 is a deficient number, since it is larger than the sum of its proper divisors (8501887297).

82561604543 is a wasteful number, since it uses less digits than its factorization.

82561604543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219358.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 82561604543 in words is "eighty-two billion, five hundred sixty-one million, six hundred four thousand, five hundred forty-three".