51657819871 has 8 divisors (see below), whose sum is σ = 60038144640. Its totient is φ = 43527654168.

The previous prime is 51657819869. The next prime is 51657819881. The reversal of 51657819871 is 17891875615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51657819871 - 2¹ = 51657819869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51657819881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62539321 + ... + 62540146.

It is an arithmetic number, because the mean of its divisors is an integer number (7504768080).

Almost surely, 2^51657819871 is an apocalyptic number.

51657819871 is a deficient number, since it is larger than the sum of its proper divisors (8380324769).

51657819871 is a wasteful number, since it uses less digits than its factorization.

51657819871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125079533.

The product of its digits is 4233600, while the sum is 58.

The spelling of 51657819871 in words is "fifty-one billion, six hundred fifty-seven million, eight hundred nineteen thousand, eight hundred seventy-one".