55213663 has 4 divisors (see below), whose sum is σ = 55358208. Its totient is φ = 55069120.

The previous prime is 55213621. The next prime is 55213667. The reversal of 55213663 is 36631255.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55213663 - 2¹⁷ = 55082591 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55213667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71698 + ... + 72463.

It is an arithmetic number, because the mean of its divisors is an integer number (13839552).

Almost surely, 2^55213663 is an apocalyptic number.

55213663 is a deficient number, since it is larger than the sum of its proper divisors (144545).

55213663 is a wasteful number, since it uses less digits than its factorization.

55213663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144544.

The product of its digits is 16200, while the sum is 31.

The square root of 55213663 is about 7430.5896805032. The cubic root of 55213663 is about 380.7870644417.

The spelling of 55213663 in words is "fifty-five million, two hundred thirteen thousand, six hundred sixty-three".