55405665 has 24 divisors (see below), whose sum is σ = 109756608. Its totient is φ = 25328160.

The previous prime is 55405663. The next prime is 55405673. The reversal of 55405665 is 56650455.

It is a happy number.

55405665 is a `hidden beast` number, since 5 + 540 + 56 + 65 = 666.

55405665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55405665 - 2¹ = 55405663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55405663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87631 + ... + 88260.

It is an arithmetic number, because the mean of its divisors is an integer number (4573192).

Almost surely, 2^55405665 is an apocalyptic number.

It is an amenable number.

55405665 is a deficient number, since it is larger than the sum of its proper divisors (54350943).

55405665 is a wasteful number, since it uses less digits than its factorization.

55405665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175909 (or 175906 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 55405665 is about 7443.4981695437. The cubic root of 55405665 is about 381.2279413915.

The spelling of 55405665 in words is "fifty-five million, four hundred five thousand, six hundred sixty-five".