51415781759 has 4 divisors (see below), whose sum is σ = 51416409504. Its totient is φ = 51415154016.

The previous prime is 51415781723. The next prime is 51415781771. The reversal of 51415781759 is 95718751415.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51415781759 is a prime.

It is a super-2 number, since 2×51415781759² (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 51415781759.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51415783759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168602 + ... + 362295.

It is an arithmetic number, because the mean of its divisors is an integer number (12854102376).

Almost surely, 2^51415781759 is an apocalyptic number.

51415781759 is a deficient number, since it is larger than the sum of its proper divisors (627745).

51415781759 is an equidigital number, since it uses as much as digits as its factorization.

51415781759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627744.

The product of its digits is 1764000, while the sum is 53.

The spelling of 51415781759 in words is "fifty-one billion, four hundred fifteen million, seven hundred eighty-one thousand, seven hundred fifty-nine".