51587055817 has 4 divisors (see below), whose sum is σ = 56276788176. Its totient is φ = 46897323460.

The previous prime is 51587055811. The next prime is 51587055893. The reversal of 51587055817 is 71855078515.

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 51587055817 - 2¹⁵ = 51587023049 is a prime.

It is a super-2 number, since 2×51587055817² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51587055811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2344866163 + ... + 2344866184.

It is an arithmetic number, because the mean of its divisors is an integer number (14069197044).

Almost surely, 2^51587055817 is an apocalyptic number.

It is an amenable number.

51587055817 is a deficient number, since it is larger than the sum of its proper divisors (4689732359).

51587055817 is a wasteful number, since it uses less digits than its factorization.

51587055817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4689732358.

The product of its (nonzero) digits is 1960000, while the sum is 52.

The spelling of 51587055817 in words is "fifty-one billion, five hundred eighty-seven million, fifty-five thousand, eight hundred seventeen".