816755557618 has 48 divisors (see below), whose sum is σ = 1653972422976. Its totient is φ = 293738253120.

The previous prime is 816755557529. The next prime is 816755557649.

816755557618 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 816755557618.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15665121 + ... + 15717172.

It is an arithmetic number, because the mean of its divisors is an integer number (34457758812).

Almost surely, 2^816755557618 is an apocalyptic number.

816755557618 is an abundant number, since it is smaller than the sum of its proper divisors (837216865358).

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

816755557618 is a wasteful number, since it uses less digits than its factorization.

816755557618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31382339 (or 31382326 counting only the distinct ones).

The product of its digits is 70560000, while the sum is 64.

The spelling of 816755557618 in words is "eight hundred sixteen billion, seven hundred fifty-five million, five hundred fifty-seven thousand, six hundred eighteen".