55366389 has 16 divisors (see below), whose sum is σ = 88334400. Its totient is φ = 34071408.

The previous prime is 55366379. The next prime is 55366391. The reversal of 55366389 is 98366355.

55366389 is a `hidden beast` number, since 5 + 5 + 3 + 6 + 638 + 9 = 666.

It is not a de Polignac number, because 55366389 - 2⁷ = 55366261 is a prime.

It is a super-3 number, since 3×55366389³ (a number of 24 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55366309) 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, 78519 + ... + 79220.

It is an arithmetic number, because the mean of its divisors is an integer number (5520900).

Almost surely, 2^55366389 is an apocalyptic number.

It is an amenable number.

55366389 is a deficient number, since it is larger than the sum of its proper divisors (32968011).

55366389 is a wasteful number, since it uses less digits than its factorization.

55366389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157761 (or 157755 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 55366389 is about 7440.8594261685. The cubic root of 55366389 is about 381.1378384025.

It can be divided in two parts, 55366 and 389, that added together give a palindrome (55755).

The spelling of 55366389 in words is "fifty-five million, three hundred sixty-six thousand, three hundred eighty-nine".