51563381759 has 16 divisors (see below), whose sum is σ = 53294841600. Its totient is φ = 49858212096.

The previous prime is 51563381747. The next prime is 51563381761. The reversal of 51563381759 is 95718336515.

It is a cyclic number.

It is not a de Polignac number, because 51563381759 - 2³² = 47268414463 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 51563381759.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51563381789) 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, 2097662 + ... + 2122100.

It is an arithmetic number, because the mean of its divisors is an integer number (3330927600).

Almost surely, 2^51563381759 is an apocalyptic number.

51563381759 is a deficient number, since it is larger than the sum of its proper divisors (1731459841).

51563381759 is a wasteful number, since it uses less digits than its factorization.

51563381759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24974.

The product of its digits is 3402000, while the sum is 53.

The spelling of 51563381759 in words is "fifty-one billion, five hundred sixty-three million, three hundred eighty-one thousand, seven hundred fifty-nine".