51566217637 has 8 divisors (see below), whose sum is σ = 56658762720. Its totient is φ = 46541123760.

The previous prime is 51566217601. The next prime is 51566217653. The reversal of 51566217637 is 73671266515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51566217637 - 2²⁷ = 51431999909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51566217667) 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 7 ways as a sum of consecutive naturals, for example, 16861198 + ... + 16864255.

It is an arithmetic number, because the mean of its divisors is an integer number (7082345340).

Almost surely, 2^51566217637 is an apocalyptic number.

It is an amenable number.

51566217637 is a deficient number, since it is larger than the sum of its proper divisors (5092545083).

51566217637 is a wasteful number, since it uses less digits than its factorization.

51566217637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33725603.

The product of its digits is 1587600, while the sum is 49.

The spelling of 51566217637 in words is "fifty-one billion, five hundred sixty-six million, two hundred seventeen thousand, six hundred thirty-seven".