51881946319 has 6 divisors (see below), whose sum is σ = 60352468224. Its totient is φ = 44470239660.

The previous prime is 51881946317. The next prime is 51881946323. The reversal of 51881946319 is 91364918815.

It is a happy number.

It is not a de Polignac number, because 51881946319 - 2¹ = 51881946317 is a prime.

It is a super-2 number, since 2×51881946319² (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 51881946319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51881946317) 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 5 ways as a sum of consecutive naturals, for example, 529407567 + ... + 529407664.

It is an arithmetic number, because the mean of its divisors is an integer number (10058744704).

Almost surely, 2^51881946319 is an apocalyptic number.

51881946319 is a deficient number, since it is larger than the sum of its proper divisors (8470521905).

51881946319 is a wasteful number, since it uses less digits than its factorization.

51881946319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058815245 (or 1058815238 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 55.

The spelling of 51881946319 in words is "fifty-one billion, eight hundred eighty-one million, nine hundred forty-six thousand, three hundred nineteen".