816857758618 has 32 divisors (see below), whose sum is σ = 1379975823360. Its totient is φ = 359274486000.

The previous prime is 816857758601. The next prime is 816857758637.

It is a happy number.

816857758618 is nontrivially palindromic in base 10.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5408103 + ... + 5557093.

It is an arithmetic number, because the mean of its divisors is an integer number (43124244480).

Almost surely, 2^816857758618 is an apocalyptic number.

816857758618 is a deficient number, since it is larger than the sum of its proper divisors (563118064742).

816857758618 is a wasteful number, since it uses less digits than its factorization.

816857758618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157074.

The product of its digits is 180633600, while the sum is 70.

The spelling of 816857758618 in words is "eight hundred sixteen billion, eight hundred fifty-seven million, seven hundred fifty-eight thousand, six hundred eighteen".