55188945 has 96 divisors (see below), whose sum is σ = 116663040. Its totient is φ = 24984288.

The previous prime is 55188923. The next prime is 55188967. The reversal of 55188945 is 54988155.

It is a happy number.

55188945 is a `hidden beast` number, since 551 + 8 + 8 + 94 + 5 = 666.

55188945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55188923) and next prime (55188967).

It is not a de Polignac number, because 55188945 - 2⁹ = 55188433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 55188945.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 535764 + ... + 535866.

It is an arithmetic number, because the mean of its divisors is an integer number (1215240).

Almost surely, 2^55188945 is an apocalyptic number.

It is an amenable number.

55188945 is an abundant number, since it is smaller than the sum of its proper divisors (61474095).

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

55188945 is an equidigital number, since it uses as much as digits as its factorization.

55188945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 118 counting only the distinct ones).

The product of its digits is 288000, while the sum is 45.

The square root of 55188945 is about 7428.9262346587. The cubic root of 55188945 is about 380.7302324967.

Subtracting from 55188945 its product of digits (288000), we obtain a palindrome (54900945).

The spelling of 55188945 in words is "fifty-five million, one hundred eighty-eight thousand, nine hundred forty-five".