55215556 has 12 divisors (see below), whose sum is σ = 105411600. Its totient is φ = 25097960.

The previous prime is 55215551. The next prime is 55215599. The reversal of 55215556 is 65551255.

It is not an unprimeable number, because it can be changed into a prime (55215551) 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, 627406 + ... + 627493.

It is an arithmetic number, because the mean of its divisors is an integer number (8784300).

Almost surely, 2^55215556 is an apocalyptic number.

It is an amenable number.

55215556 is a deficient number, since it is larger than the sum of its proper divisors (50196044).

55215556 is a wasteful number, since it uses less digits than its factorization.

55215556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254914 (or 1254912 counting only the distinct ones).

The product of its digits is 37500, while the sum is 34.

The square root of 55215556 is about 7430.7170582656. The cubic root of 55215556 is about 380.7914161525.

The spelling of 55215556 in words is "fifty-five million, two hundred fifteen thousand, five hundred fifty-six".