845252218818 has 270 divisors, whose sum is σ = 2344300624809. Its totient is φ = 226920258432.

The previous prime is 845252218799. The next prime is 845252218819. The reversal of 845252218818 is 818812252548.

845252218818 is a `hidden beast` number, since 8 + 4 + 525 + 2 + 21 + 88 + 18 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 773595888849 + 71656329969 = 879543^2 + 267687^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=650097.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (845252218819) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 1392507471 + ... + 1392508077.

Almost surely, 2^845252218818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 845252218818

845252218818 is an abundant number, since it is smaller than the sum of its proper divisors (1499048405991).

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

845252218818 is an equidigital number, since it uses as much as digits as its factorization.

845252218818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276 (or 636 counting only the distinct ones).

The product of its digits is 3276800, while the sum is 54.

The spelling of 845252218818 in words is "eight hundred forty-five billion, two hundred fifty-two million, two hundred eighteen thousand, eight hundred eighteen".