51566650565 has 8 divisors (see below), whose sum is σ = 61881902880. Its totient is φ = 41252038992.

The previous prime is 51566650543. The next prime is 51566650607. The reversal of 51566650565 is 56505666515.

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 51566650565 - 2³² = 47271683269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39506 + ... + 323564.

It is an arithmetic number, because the mean of its divisors is an integer number (7735237860).

Almost surely, 2^51566650565 is an apocalyptic number.

It is an amenable number.

51566650565 is a deficient number, since it is larger than the sum of its proper divisors (10315252315).

51566650565 is a wasteful number, since it uses less digits than its factorization.

51566650565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320371.

The product of its (nonzero) digits is 4050000, while the sum is 50.

The spelling of 51566650565 in words is "fifty-one billion, five hundred sixty-six million, six hundred fifty thousand, five hundred sixty-five".