55185993 has 12 divisors (see below), whose sum is σ = 83179200. Its totient is φ = 35190936.

The previous prime is 55185989. The next prime is 55185997. The reversal of 55185993 is 39958155.

55185993 is a `hidden beast` number, since 5 + 51 + 8 + 599 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (55185989) and next prime (55185997).

It is not a de Polignac number, because 55185993 - 2² = 55185989 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (55185997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133093 + ... + 133506.

It is an arithmetic number, because the mean of its divisors is an integer number (6931600).

Almost surely, 2^55185993 is an apocalyptic number.

It is an amenable number.

55185993 is a deficient number, since it is larger than the sum of its proper divisors (27993207).

55185993 is a wasteful number, since it uses less digits than its factorization.

55185993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266628 (or 266625 counting only the distinct ones).

The product of its digits is 243000, while the sum is 45.

The square root of 55185993 is about 7428.7275491836. The cubic root of 55185993 is about 380.7234440860.

It can be divided in two parts, 5518 and 5993, that added together give a palindrome (11511).

The spelling of 55185993 in words is "fifty-five million, one hundred eighty-five thousand, nine hundred ninety-three".