51853235816 has 16 divisors (see below), whose sum is σ = 97229479140. Its totient is φ = 25925374720.

The previous prime is 51853235813. The next prime is 51853235821. The reversal of 51853235816 is 61853235815.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 40308592900 + 11544642916 = 200770^2 + 107446^2 .

It is not an unprimeable number, because it can be changed into a prime (51853235813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35690 + ... + 324006.

Almost surely, 2^51853235816 is an apocalyptic number.

It is an amenable number.

51853235816 is a deficient number, since it is larger than the sum of its proper divisors (45376243324).

51853235816 is a wasteful number, since it uses less digits than its factorization.

51853235816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310804 (or 310800 counting only the distinct ones).

The product of its digits is 864000, while the sum is 47.

Subtracting 51853235816 from its reverse (61853235815), we obtain a palindrome (9999999999).

The spelling of 51853235816 in words is "fifty-one billion, eight hundred fifty-three million, two hundred thirty-five thousand, eight hundred sixteen".