51705220219 has 4 divisors (see below), whose sum is σ = 53953273296. Its totient is φ = 49457167144.

The previous prime is 51705220211. The next prime is 51705220223. The reversal of 51705220219 is 91202250715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51705220219 - 2³ = 51705220211 is a prime.

It is a super-2 number, since 2×51705220219² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51705220211) 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 3 ways as a sum of consecutive naturals, for example, 1124026504 + ... + 1124026549.

It is an arithmetic number, because the mean of its divisors is an integer number (13488318324).

Almost surely, 2^51705220219 is an apocalyptic number.

51705220219 is a deficient number, since it is larger than the sum of its proper divisors (2248053077).

51705220219 is a wasteful number, since it uses less digits than its factorization.

51705220219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248053076.

The product of its (nonzero) digits is 12600, while the sum is 34.

The spelling of 51705220219 in words is "fifty-one billion, seven hundred five million, two hundred twenty thousand, two hundred nineteen".