4537821618 has 72 divisors (see below), whose sum is σ = 10822675500. Its totient is φ = 1373106240.

The previous prime is 4537821581. The next prime is 4537821647. The reversal of 4537821618 is 8161287354.

4537821618 is a `hidden beast` number, since 4 + 5 + 3 + 7 + 8 + 21 + 618 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4439157129 + 98664489 = 66627^2 + 9933^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2327308 + ... + 2329256.

Almost surely, 2^4537821618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4537821618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5411337750).

4537821618 is an abundant number, since it is smaller than the sum of its proper divisors (6284853882).

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

4537821618 is a wasteful number, since it uses less digits than its factorization.

4537821618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048 (or 3034 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 4537821618 is about 67363.3551569397. The cubic root of 4537821618 is about 1655.5760681448.

The spelling of 4537821618 in words is "four billion, five hundred thirty-seven million, eight hundred twenty-one thousand, six hundred eighteen".