51800278166650 has 48 divisors (see below), whose sum is σ = 104286642274584. Its totient is φ = 19029168910080.

The previous prime is 51800278166557. The next prime is 51800278166653. The reversal of 51800278166650 is 5666187200815.

It can be written as a sum of positive squares in 12 ways, for example, as 7891936129081 + 43908342037569 = 2809259^2 + 6626337^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51800278166591 and 51800278166600.

It is not an unprimeable number, because it can be changed into a prime (51800278166653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202137777 + ... + 202393876.

Almost surely, 2^{51800278166650} is an apocalyptic number.

51800278166650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51800278166650 is an abundant number, since it is smaller than the sum of its proper divisors (52486364107934).

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

51800278166650 is a wasteful number, since it uses less digits than its factorization.

51800278166650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404531875 (or 404531870 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 51800278166650 in words is "fifty-one trillion, eight hundred billion, two hundred seventy-eight million, one hundred sixty-six thousand, six hundred fifty".