51606565671 has 8 divisors (see below), whose sum is σ = 69117314560. Its totient is φ = 34250096952.

The previous prime is 51606565649. The next prime is 51606565691. The reversal of 51606565671 is 17656560615.

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

It is not a de Polignac number, because 51606565671 - 2¹¹ = 51606563623 is a prime.

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 51606565671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51606565631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38569261 + ... + 38570598.

It is an arithmetic number, because the mean of its divisors is an integer number (8639664320).

Almost surely, 2^51606565671 is an apocalyptic number.

51606565671 is a deficient number, since it is larger than the sum of its proper divisors (17510748889).

51606565671 is a wasteful number, since it uses less digits than its factorization.

51606565671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77140085.

The product of its (nonzero) digits is 1134000, while the sum is 48.

The spelling of 51606565671 in words is "fifty-one billion, six hundred six million, five hundred sixty-five thousand, six hundred seventy-one".