51666656 has 12 divisors (see below), whose sum is σ = 101718792. Its totient is φ = 25833312.

The previous prime is 51666649. The next prime is 51666707. The reversal of 51666656 is 65666615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 807260 + ... + 807323.

It is an arithmetic number, because the mean of its divisors is an integer number (8476566).

Almost surely, 2^51666656 is an apocalyptic number.

It is an amenable number.

51666656 is a deficient number, since it is larger than the sum of its proper divisors (50052136).

51666656 is a wasteful number, since it uses less digits than its factorization.

51666656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1614593 (or 1614585 counting only the distinct ones).

The product of its digits is 194400, while the sum is 41.

The square root of 51666656 is about 7187.9521423003. The cubic root of 51666656 is about 372.4518346804.

Subtracting from 51666656 its sum of digits (41), we obtain a palindrome (51666615).

It can be divided in two parts, 5 and 1666656, that added together give a palindrome (1666661).

The spelling of 51666656 in words is "fifty-one million, six hundred sixty-six thousand, six hundred fifty-six".