55188155 has 16 divisors (see below), whose sum is σ = 75389184. Its totient is φ = 38390880.

The previous prime is 55188151. The next prime is 55188193.

It is a happy number.

55188155 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55188155 - 2² = 55188151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55188151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20549 + ... + 23078.

It is an arithmetic number, because the mean of its divisors is an integer number (4711824).

Almost surely, 2^55188155 is an apocalyptic number.

55188155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55188155 is a deficient number, since it is larger than the sum of its proper divisors (20201029).

55188155 is a wasteful number, since it uses less digits than its factorization.

55188155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43666.

The product of its digits is 40000, while the sum is 38.

The square root of 55188155 is about 7428.8730639310. The cubic root of 55188155 is about 380.7284158387.

The spelling of 55188155 in words is "fifty-five million, one hundred eighty-eight thousand, one hundred fifty-five".