52781572818 has 48 divisors (see below), whose sum is σ = 123281075736. Its totient is φ = 16224122880.

The previous prime is 52781572787. The next prime is 52781572843. The reversal of 52781572818 is 81827518725.

52781572818 is a `hidden beast` number, since 52 + 7 + 8 + 1 + 572 + 8 + 18 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 49525386849 + 3256185969 = 222543^2 + 57063^2 .

It is a super-2 number, since 2×52781572818² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

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, 120178 + ... + 346418.

Almost surely, 2^52781572818 is an apocalyptic number.

52781572818 is an abundant number, since it is smaller than the sum of its proper divisors (70499502918).

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

52781572818 is a wasteful number, since it uses less digits than its factorization.

52781572818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227259 (or 227256 counting only the distinct ones).

The product of its digits is 2508800, while the sum is 54.

The spelling of 52781572818 in words is "fifty-two billion, seven hundred eighty-one million, five hundred seventy-two thousand, eight hundred eighteen".