51666853519 has 16 divisors (see below), whose sum is σ = 54189473184. Its totient is φ = 49205721600.

The previous prime is 51666853517. The next prime is 51666853561. The reversal of 51666853519 is 91535866615.

It is a cyclic number.

It is not a de Polignac number, because 51666853519 - 2¹ = 51666853517 is a prime.

It is a super-2 number, since 2×51666853519² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51666853519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51666853517) 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 15 ways as a sum of consecutive naturals, for example, 3400299 + ... + 3415459.

It is an arithmetic number, because the mean of its divisors is an integer number (3386842074).

Almost surely, 2^51666853519 is an apocalyptic number.

51666853519 is a deficient number, since it is larger than the sum of its proper divisors (2522619665).

51666853519 is a wasteful number, since it uses less digits than its factorization.

51666853519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17178.

The product of its digits is 5832000, while the sum is 55.

It can be divided in two parts, 51666 and 853519, that added together give a triangular number (905185 = T₁₃₄₅).

The spelling of 51666853519 in words is "fifty-one billion, six hundred sixty-six million, eight hundred fifty-three thousand, five hundred nineteen".