51566665606 has 16 divisors (see below), whose sum is σ = 81543997440. Its totient is φ = 24420725640.

The previous prime is 51566665571. The next prime is 51566665621. The reversal of 51566665606 is 60656666515.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 8845176 + ... + 8851003.

It is an arithmetic number, because the mean of its divisors is an integer number (5096499840).

Almost surely, 2^51566665606 is an apocalyptic number.

51566665606 is a deficient number, since it is larger than the sum of its proper divisors (29977331834).

51566665606 is a wasteful number, since it uses less digits than its factorization.

51566665606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17696259.

The product of its (nonzero) digits is 5832000, while the sum is 52.

Subtracting 51566665606 from its reverse (60656666515), we obtain a palindrome (9090000909).

The spelling of 51566665606 in words is "fifty-one billion, five hundred sixty-six million, six hundred sixty-five thousand, six hundred six".