816815982585 has 16 divisors (see below), whose sum is σ = 1351971282240. Its totient is φ = 420613287360.

The previous prime is 816815982583. The next prime is 816815982617. The reversal of 816815982585 is 585289518618.

It is not a de Polignac number, because 816815982585 - 2¹ = 816815982583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816815982583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 938868511 + ... + 938869380.

It is an arithmetic number, because the mean of its divisors is an integer number (84498205140).

Almost surely, 2^816815982585 is an apocalyptic number.

It is an amenable number.

816815982585 is a deficient number, since it is larger than the sum of its proper divisors (535155299655).

816815982585 is a wasteful number, since it uses less digits than its factorization.

816815982585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877737928.

The product of its digits is 55296000, while the sum is 66.

The spelling of 816815982585 in words is "eight hundred sixteen billion, eight hundred fifteen million, nine hundred eighty-two thousand, five hundred eighty-five".