55668389 has 4 divisors (see below), whose sum is σ = 63621024. Its totient is φ = 47715756.

The previous prime is 55668373. The next prime is 55668419. The reversal of 55668389 is 98386655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55668389 - 2⁴ = 55668373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55668289) 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, 3976307 + ... + 3976320.

It is an arithmetic number, because the mean of its divisors is an integer number (15905256).

Almost surely, 2^55668389 is an apocalyptic number.

It is an amenable number.

55668389 is a deficient number, since it is larger than the sum of its proper divisors (7952635).

55668389 is an equidigital number, since it uses as much as digits as its factorization.

55668389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7952634.

The product of its digits is 1555200, while the sum is 50.

The square root of 55668389 is about 7461.1251832415. The cubic root of 55668389 is about 381.8295635977.

The spelling of 55668389 in words is "fifty-five million, six hundred sixty-eight thousand, three hundred eighty-nine".