51216656 has 20 divisors (see below), whose sum is σ = 101106252. Its totient is φ = 25124736.

The previous prime is 51216643. The next prime is 51216689. The reversal of 51216656 is 65661215.

It can be written as a sum of positive squares in 2 ways, for example, as 24010000 + 27206656 = 4900^2 + 5216^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29351 + ... + 31046.

Almost surely, 2^51216656 is an apocalyptic number.

It is an amenable number.

51216656 is a deficient number, since it is larger than the sum of its proper divisors (49889596).

51216656 is a wasteful number, since it uses less digits than its factorization.

51216656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60458 (or 60452 counting only the distinct ones).

The product of its digits is 10800, while the sum is 32.

The square root of 51216656 is about 7156.5813067414. The cubic root of 51216656 is about 371.3673681066.

The spelling of 51216656 in words is "fifty-one million, two hundred sixteen thousand, six hundred fifty-six".