51669656 has 16 divisors (see below), whose sum is σ = 96957000. Its totient is φ = 25814464.

The previous prime is 51669643. The next prime is 51669659. The reversal of 51669656 is 65696615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51669659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17795 + ... + 20493.

Almost surely, 2^51669656 is an apocalyptic number.

It is an amenable number.

51669656 is a deficient number, since it is larger than the sum of its proper divisors (45287344).

51669656 is a wasteful number, since it uses less digits than its factorization.

51669656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5098 (or 5094 counting only the distinct ones).

The product of its digits is 291600, while the sum is 44.

The square root of 51669656 is about 7188.1608217958. The cubic root of 51669656 is about 372.4590432876.

It can be divided in two parts, 51669 and 656, that added together give a palindrome (52325).

The spelling of 51669656 in words is "fifty-one million, six hundred sixty-nine thousand, six hundred fifty-six".