55411818 has 128 divisors (see below), whose sum is σ = 147308544. Its totient is φ = 13478400.

The previous prime is 55411813. The next prime is 55411819. The reversal of 55411818 is 81811455.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (55411813) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 759030 + ... + 759102.

It is an arithmetic number, because the mean of its divisors is an integer number (1150848).

Almost surely, 2^55411818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55411818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73654272).

55411818 is an abundant number, since it is smaller than the sum of its proper divisors (91896726).

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

55411818 is a wasteful number, since it uses less digits than its factorization.

55411818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180.

The product of its digits is 6400, while the sum is 33.

The square root of 55411818 is about 7443.9114718003. The cubic root of 55411818 is about 381.2420531175.

The spelling of 55411818 in words is "fifty-five million, four hundred eleven thousand, eight hundred eighteen".