82581516899 has 64 divisors (see below), whose sum is σ = 101318181888. Its totient is φ = 65840947200.

The previous prime is 82581516887. The next prime is 82581516923. The reversal of 82581516899 is 99861518528.

It is a happy number.

It is a Cunningham number, because it is equal to 287370²-1.

It is not a de Polignac number, because 82581516899 - 2⁸ = 82581516643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82581516299) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 122706227 + ... + 122706899.

It is an arithmetic number, because the mean of its divisors is an integer number (1583096592).

Almost surely, 2^82581516899 is an apocalyptic number.

82581516899 is a deficient number, since it is larger than the sum of its proper divisors (18736664989).

82581516899 is a wasteful number, since it uses less digits than its factorization.

82581516899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988.

The product of its digits is 12441600, while the sum is 62.

The spelling of 82581516899 in words is "eighty-two billion, five hundred eighty-one million, five hundred sixteen thousand, eight hundred ninety-nine".