51656758447878 has 24 divisors (see below), whose sum is σ = 111984778461816. Its totient is φ = 17209411509600.

The previous prime is 51656758447871. The next prime is 51656758447907. The reversal of 51656758447878 is 87874485765615.

51656758447878 is a `hidden beast` number, since 5 + 1 + 6 + 5 + 6 + 75 + 8 + 4 + 478 + 78 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 51656758447797 and 51656758447806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656758447871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 792297583 + ... + 792362778.

It is an arithmetic number, because the mean of its divisors is an integer number (4666032435909).

Almost surely, 2^{51656758447878} is an apocalyptic number.

51656758447878 is an abundant number, since it is smaller than the sum of its proper divisors (60328020013938).

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

51656758447878 is a wasteful number, since it uses less digits than its factorization.

51656758447878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584662180 (or 1584662177 counting only the distinct ones).

The product of its digits is 12644352000, while the sum is 81.

The spelling of 51656758447878 in words is "fifty-one trillion, six hundred fifty-six billion, seven hundred fifty-eight million, four hundred forty-seven thousand, eight hundred seventy-eight".