816455554618 has 32 divisors (see below), whose sum is σ = 1356726843072. Its totient is φ = 365381827200.

The previous prime is 816455554553. The next prime is 816455554619.

816455554618 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×816455554618² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (816455554619) by changing a digit.

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, 452688 + ... + 1355668.

It is an arithmetic number, because the mean of its divisors is an integer number (42397713846).

Almost surely, 2^816455554618 is an apocalyptic number.

816455554618 is a deficient number, since it is larger than the sum of its proper divisors (540271288454).

816455554618 is a wasteful number, since it uses less digits than its factorization.

816455554618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903630.

The product of its digits is 23040000, while the sum is 58.

The spelling of 816455554618 in words is "eight hundred sixteen billion, four hundred fifty-five million, five hundred fifty-four thousand, six hundred eighteen".