55111716 has 72 divisors (see below), whose sum is σ = 157248000. Its totient is φ = 16121280.

The previous prime is 55111711. The next prime is 55111717. The reversal of 55111716 is 61711155.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 55111716.

It is not an unprimeable number, because it can be changed into a prime (55111711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9085 + ... + 13883.

It is an arithmetic number, because the mean of its divisors is an integer number (2184000).

Almost surely, 2^55111716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55111716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78624000).

55111716 is an abundant number, since it is smaller than the sum of its proper divisors (102136284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55111716 is a wasteful number, since it uses less digits than its factorization.

55111716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4849 (or 4844 counting only the distinct ones).

The product of its digits is 1050, while the sum is 27.

The square root of 55111716 is about 7423.7265574642. The cubic root of 55111716 is about 380.5525571725.

It can be divided in two parts, 5511 and 1716, that added together give a palindrome (7227).

The spelling of 55111716 in words is "fifty-five million, one hundred eleven thousand, seven hundred sixteen".