51783921791 has 8 divisors (see below), whose sum is σ = 59221597344. Its totient is φ = 44356239360.

The previous prime is 51783921779. The next prime is 51783921817. The reversal of 51783921791 is 19712938715.

It is a happy number.

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 51783921791 - 2⁶ = 51783921727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51783921491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2487170 + ... + 2507903.

It is an arithmetic number, because the mean of its divisors is an integer number (7402699668).

Almost surely, 2^51783921791 is an apocalyptic number.

51783921791 is a deficient number, since it is larger than the sum of its proper divisors (7437675553).

51783921791 is a wasteful number, since it uses less digits than its factorization.

51783921791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4996561.

The product of its digits is 952560, while the sum is 53.

The spelling of 51783921791 in words is "fifty-one billion, seven hundred eighty-three million, nine hundred twenty-one thousand, seven hundred ninety-one".