55111155 has 32 divisors (see below), whose sum is σ = 97175808. Its totient is φ = 26448000.

The previous prime is 55111141. The next prime is 55111159.

55111155 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55111155 - 2⁴ = 55111139 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55111159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15012 + ... + 18318.

It is an arithmetic number, because the mean of its divisors is an integer number (3036744).

Almost surely, 2^55111155 is an apocalyptic number.

55111155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55111155 is a deficient number, since it is larger than the sum of its proper divisors (42064653).

55111155 is a wasteful number, since it uses less digits than its factorization.

55111155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3427.

The product of its digits is 625, while the sum is 24.

The square root of 55111155 is about 7423.6887731100. The cubic root of 55111155 is about 380.5512659123.

It can be divided in two parts, 5511 and 1155, that added together give a palindrome (6666).

The spelling of 55111155 in words is "fifty-five million, one hundred eleven thousand, one hundred fifty-five".