55185185 has 8 divisors (see below), whose sum is σ = 72242496. Its totient is φ = 40134640.

The previous prime is 55185181. The next prime is 55185197. The reversal of 55185185 is 58158155.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55185185 - 2² = 55185181 is a prime.

It is a Duffinian number.

55185185 is a modest number, since divided by 185185 gives 55 as remainder.

It is not an unprimeable number, because it can be changed into a prime (55185181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501629 + ... + 501738.

It is an arithmetic number, because the mean of its divisors is an integer number (9030312).

Almost surely, 2^55185185 is an apocalyptic number.

55185185 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55185185 is a deficient number, since it is larger than the sum of its proper divisors (17057311).

55185185 is a wasteful number, since it uses less digits than its factorization.

55185185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003383.

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

The square root of 55185185 is about 7428.6731655121. The cubic root of 55185185 is about 380.7215859693.

It can be divided in two parts, 5518 and 5185, that multiplied together give a triangular number (28610830 = T₇₅₆₄).

The spelling of 55185185 in words is "fifty-five million, one hundred eighty-five thousand, one hundred eighty-five".