51655642 has 32 divisors (see below), whose sum is σ = 84553920. Its totient is φ = 23587200.

The previous prime is 51655627. The next prime is 51655649. The reversal of 51655642 is 24655615.

51655642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51655598 and 51655607.

It is not an unprimeable number, because it can be changed into a prime (51655649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164878 + ... + 165190.

It is an arithmetic number, because the mean of its divisors is an integer number (2642310).

Almost surely, 2^51655642 is an apocalyptic number.

51655642 is a deficient number, since it is larger than the sum of its proper divisors (32898278).

51655642 is a wasteful number, since it uses less digits than its factorization.

51655642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478.

The product of its digits is 36000, while the sum is 34.

The square root of 51655642 is about 7187.1859583567. The cubic root of 51655642 is about 372.4253670876.

The spelling of 51655642 in words is "fifty-one million, six hundred fifty-five thousand, six hundred forty-two".