51685166850 has 48 divisors (see below), whose sum is σ = 128642058048. Its totient is φ = 13732943040.

The previous prime is 51685166849. The next prime is 51685166873. The reversal of 51685166850 is 5866158615.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51685166793 and 51685166802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 580414 + ... + 663513.

It is an arithmetic number, because the mean of its divisors is an integer number (2680042876).

Almost surely, 2^51685166850 is an apocalyptic number.

51685166850 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51685166850 is an abundant number, since it is smaller than the sum of its proper divisors (76956891198).

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

51685166850 is a wasteful number, since it uses less digits than its factorization.

51685166850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244219 (or 1244214 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 51.

The spelling of 51685166850 in words is "fifty-one billion, six hundred eighty-five million, one hundred sixty-six thousand, eight hundred fifty".