51566066515 has 4 divisors (see below), whose sum is σ = 61879279824. Its totient is φ = 41252853208.

The previous prime is 51566066509. The next prime is 51566066537.

51566066515 is nontrivially palindromic in base 10.

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 51566066515 - 2²¹ = 51563969363 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 5156606647 + ... + 5156606656.

It is an arithmetic number, because the mean of its divisors is an integer number (15469819956).

Almost surely, 2^51566066515 is an apocalyptic number.

51566066515 is a deficient number, since it is larger than the sum of its proper divisors (10313213309).

51566066515 is a wasteful number, since it uses less digits than its factorization.

51566066515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10313213308.

The product of its (nonzero) digits is 810000, while the sum is 46.

Subtracting from 51566066515 its product of nonzero digits (810000), we obtain a palindrome (51565256515).

The spelling of 51566066515 in words is "fifty-one billion, five hundred sixty-six million, sixty-six thousand, five hundred fifteen".