51668985678 has 16 divisors (see below), whose sum is σ = 104126812416. Its totient is φ = 17091521720.

The previous prime is 51668985671. The next prime is 51668985691. The reversal of 51668985678 is 87658986615.

51668985678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51668985671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32867526 + ... + 32869097.

It is an arithmetic number, because the mean of its divisors is an integer number (6507925776).

Almost surely, 2^51668985678 is an apocalyptic number.

51668985678 is an abundant number, since it is smaller than the sum of its proper divisors (52457826738).

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

51668985678 is a wasteful number, since it uses less digits than its factorization.

51668985678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65736759.

The product of its digits is 174182400, while the sum is 69.

The spelling of 51668985678 in words is "fifty-one billion, six hundred sixty-eight million, nine hundred eighty-five thousand, six hundred seventy-eight".