51605566067 has 4 divisors (see below), whose sum is σ = 56296981176. Its totient is φ = 46914150960.

The previous prime is 51605566021. The next prime is 51605566079. The reversal of 51605566067 is 76066550615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51605566067 - 2¹⁸ = 51605303923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51605566567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2345707538 + ... + 2345707559.

It is an arithmetic number, because the mean of its divisors is an integer number (14074245294).

Almost surely, 2^51605566067 is an apocalyptic number.

51605566067 is a deficient number, since it is larger than the sum of its proper divisors (4691415109).

51605566067 is a wasteful number, since it uses less digits than its factorization.

51605566067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4691415108.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 51605566067 in words is "fifty-one billion, six hundred five million, five hundred sixty-six thousand, sixty-seven".