51868498569857 has 8 divisors (see below), whose sum is σ = 51889904730120. Its totient is φ = 51847094476800.

The previous prime is 51868498569827. The next prime is 51868498569871. The reversal of 51868498569857 is 75896589486815.

51868498569857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9610750214641 + 42257748355216 = 3100121^2 + 6500596^2 .

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 51868498569857 - 2⁶ = 51868498569793 is a prime.

It is a super-2 number, since 2×51868498569857² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51868498569827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50721233 + ... + 51733745.

It is an arithmetic number, because the mean of its divisors is an integer number (6486238091265).

Almost surely, 2^{51868498569857} is an apocalyptic number.

It is an amenable number.

51868498569857 is a deficient number, since it is larger than the sum of its proper divisors (21406160263).

51868498569857 is a wasteful number, since it uses less digits than its factorization.

51868498569857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033603.

The product of its digits is 41803776000, while the sum is 89.

The spelling of 51868498569857 in words is "fifty-one trillion, eight hundred sixty-eight billion, four hundred ninety-eight million, five hundred sixty-nine thousand, eight hundred fifty-seven".