55666565 has 8 divisors (see below), whose sum is σ = 68221440. Its totient is φ = 43585552.

The previous prime is 55666543. The next prime is 55666577. The reversal of 55666565 is 56566655.

55666565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 55666565 - 2⁸ = 55666309 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 118205 + ... + 118674.

It is an arithmetic number, because the mean of its divisors is an integer number (8527680).

Almost surely, 2^55666565 is an apocalyptic number.

It is an amenable number.

55666565 is a deficient number, since it is larger than the sum of its proper divisors (12554875).

55666565 is a wasteful number, since it uses less digits than its factorization.

55666565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236931.

The product of its digits is 810000, while the sum is 44.

The square root of 55666565 is about 7461.0029486658. The cubic root of 55666565 is about 381.8253932792.

Subtracting from 55666565 its sum of digits (44), we obtain a square (55666521 = 7461²).

The spelling of 55666565 in words is "fifty-five million, six hundred sixty-six thousand, five hundred sixty-five".