51563135517 has 4 divisors (see below), whose sum is σ = 68750847360. Its totient is φ = 34375423676.

The previous prime is 51563135513. The next prime is 51563135531. The reversal of 51563135517 is 71553136515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51563135517 - 2² = 51563135513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51563135513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8593855917 + ... + 8593855922.

It is an arithmetic number, because the mean of its divisors is an integer number (17187711840).

Almost surely, 2^51563135517 is an apocalyptic number.

It is an amenable number.

51563135517 is a deficient number, since it is larger than the sum of its proper divisors (17187711843).

51563135517 is a wasteful number, since it uses less digits than its factorization.

51563135517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17187711842.

The product of its digits is 236250, while the sum is 42.

The spelling of 51563135517 in words is "fifty-one billion, five hundred sixty-three million, one hundred thirty-five thousand, five hundred seventeen".