55215563 has 16 divisors (see below), whose sum is σ = 60947040. Its totient is φ = 49711104.

The previous prime is 55215551. The next prime is 55215599. The reversal of 55215563 is 36551255.

55215563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 55215563 - 2¹⁰ = 55214539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55215533) 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, 147845 + ... + 148217.

It is an arithmetic number, because the mean of its divisors is an integer number (3809190).

Almost surely, 2^55215563 is an apocalyptic number.

55215563 is a deficient number, since it is larger than the sum of its proper divisors (5731477).

55215563 is a wasteful number, since it uses less digits than its factorization.

55215563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638.

The product of its digits is 22500, while the sum is 32.

The square root of 55215563 is about 7430.7175292834. The cubic root of 55215563 is about 380.7914322442.

The spelling of 55215563 in words is "fifty-five million, two hundred fifteen thousand, five hundred sixty-three".