51587663573 has 4 divisors (see below), whose sum is σ = 51588176640. Its totient is φ = 51587150508.

The previous prime is 51587663557. The next prime is 51587663653. The reversal of 51587663573 is 37536678515.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51587663573 - 2⁴ = 51587663557 is a prime.

It is a super-2 number, since 2×51587663573² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51587663503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50615 + ... + 325172.

It is an arithmetic number, because the mean of its divisors is an integer number (12897044160).

Almost surely, 2^51587663573 is an apocalyptic number.

It is an amenable number.

51587663573 is a deficient number, since it is larger than the sum of its proper divisors (513067).

51587663573 is a wasteful number, since it uses less digits than its factorization.

51587663573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513066.

The product of its digits is 15876000, while the sum is 56.

The spelling of 51587663573 in words is "fifty-one billion, five hundred eighty-seven million, six hundred sixty-three thousand, five hundred seventy-three".