55216855 has 4 divisors (see below), whose sum is σ = 66260232. Its totient is φ = 44173480.

The previous prime is 55216853. The next prime is 55216871. The reversal of 55216855 is 55861255.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55861255 = 5 ⋅11172251.

It is not a de Polignac number, because 55216855 - 2¹ = 55216853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55216853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5521681 + ... + 5521690.

It is an arithmetic number, because the mean of its divisors is an integer number (16565058).

Almost surely, 2^55216855 is an apocalyptic number.

55216855 is a deficient number, since it is larger than the sum of its proper divisors (11043377).

55216855 is a wasteful number, since it uses less digits than its factorization.

55216855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11043376.

The product of its digits is 60000, while the sum is 37.

The square root of 55216855 is about 7430.8044651976. The cubic root of 55216855 is about 380.7944022926.

The spelling of 55216855 in words is "fifty-five million, two hundred sixteen thousand, eight hundred fifty-five".