51863140808 has 8 divisors (see below), whose sum is σ = 97243389030. Its totient is φ = 25931570400.

The previous prime is 51863140757. The next prime is 51863140811. The reversal of 51863140808 is 80804136815.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 51829986244 + 33154564 = 227662^2 + 5758^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3241446293 + ... + 3241446308.

Almost surely, 2^51863140808 is an apocalyptic number.

It is an amenable number.

51863140808 is a deficient number, since it is larger than the sum of its proper divisors (45380248222).

51863140808 is a wasteful number, since it uses less digits than its factorization.

51863140808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6482892607 (or 6482892603 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The spelling of 51863140808 in words is "fifty-one billion, eight hundred sixty-three million, one hundred forty thousand, eight hundred eight".