55666605 has 8 divisors (see below), whose sum is σ = 89066592. Its totient is φ = 29688848.

The previous prime is 55666577. The next prime is 55666613. The reversal of 55666605 is 50666655.

It is a happy number.

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 55666605 - 2¹⁰ = 55665581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1855539 + ... + 1855568.

It is an arithmetic number, because the mean of its divisors is an integer number (11133324).

Almost surely, 2^55666605 is an apocalyptic number.

It is an amenable number.

55666605 is a deficient number, since it is larger than the sum of its proper divisors (33399987).

55666605 is a wasteful number, since it uses less digits than its factorization.

55666605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3711115.

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 55666605 is about 7461.0056292701. The cubic root of 55666605 is about 381.8254847346.

It can be divided in two parts, 556 and 66605, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 55666605 in words is "fifty-five million, six hundred sixty-six thousand, six hundred five".