55189555 has 4 divisors (see below), whose sum is σ = 66227472. Its totient is φ = 44151640.

The previous prime is 55189549. The next prime is 55189559. The reversal of 55189555 is 55598155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55598155 = 5 ⋅11119631.

It is not a de Polignac number, because 55189555 - 2⁷ = 55189427 is a prime.

It is a super-3 number, since 3×55189555³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55189559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5518951 + ... + 5518960.

It is an arithmetic number, because the mean of its divisors is an integer number (16556868).

Almost surely, 2^55189555 is an apocalyptic number.

55189555 is a deficient number, since it is larger than the sum of its proper divisors (11037917).

55189555 is a wasteful number, since it uses less digits than its factorization.

55189555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11037916.

The product of its digits is 225000, while the sum is 43.

The square root of 55189555 is about 7428.9672902766. The cubic root of 55189555 is about 380.7316352208.

The spelling of 55189555 in words is "fifty-five million, one hundred eighty-nine thousand, five hundred fifty-five".