51004878856 has 8 divisors (see below), whose sum is σ = 95634147870. Its totient is φ = 25502439424.

The previous prime is 51004878853. The next prime is 51004878857. The reversal of 51004878856 is 65887840015.

It can be written as a sum of positive squares in only one way, i.e., 50314976100 + 689902756 = 224310^2 + 26266^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (51004878853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3187804921 + ... + 3187804936.

Almost surely, 2^51004878856 is an apocalyptic number.

It is an amenable number.

51004878856 is a deficient number, since it is larger than the sum of its proper divisors (44629269014).

51004878856 is a wasteful number, since it uses less digits than its factorization.

51004878856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6375609863 (or 6375609859 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 52.

The spelling of 51004878856 in words is "fifty-one billion, four million, eight hundred seventy-eight thousand, eight hundred fifty-six".