51171898668 has 24 divisors (see below), whose sum is σ = 130255742400. Its totient is φ = 15506635920.

The previous prime is 51171898667. The next prime is 51171898709. The reversal of 51171898668 is 86689817115.

51171898668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51171898667) 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, 193832818 + ... + 193833081.

It is an arithmetic number, because the mean of its divisors is an integer number (5427322600).

Almost surely, 2^51171898668 is an apocalyptic number.

It is an amenable number.

51171898668 is an abundant number, since it is smaller than the sum of its proper divisors (79083843732).

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

51171898668 is a wasteful number, since it uses less digits than its factorization.

51171898668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387665917 (or 387665915 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 60.

The spelling of 51171898668 in words is "fifty-one billion, one hundred seventy-one million, eight hundred ninety-eight thousand, six hundred sixty-eight".