51555656 has 32 divisors (see below), whose sum is σ = 98884800. Its totient is φ = 25193280.

The previous prime is 51555643. The next prime is 51555659. The reversal of 51555656 is 65655515.

It is not an unprimeable number, because it can be changed into a prime (51555659) 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 7 ways as a sum of consecutive naturals, for example, 78626 + ... + 79278.

It is an arithmetic number, because the mean of its divisors is an integer number (3090150).

Almost surely, 2^51555656 is an apocalyptic number.

It is an amenable number.

51555656 is a deficient number, since it is larger than the sum of its proper divisors (47329144).

51555656 is a wasteful number, since it uses less digits than its factorization.

51555656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869 (or 865 counting only the distinct ones).

The product of its digits is 112500, while the sum is 38.

The square root of 51555656 is about 7180.2267373670. The cubic root of 51555656 is about 372.1849198165.

The spelling of 51555656 in words is "fifty-one million, five hundred fifty-five thousand, six hundred fifty-six".