55666015 has 4 divisors (see below), whose sum is σ = 66799224. Its totient is φ = 44532808.

The previous prime is 55665989. The next prime is 55666021. The reversal of 55666015 is 51066655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51066655 = 5 ⋅10213331.

It is a cyclic number.

It is not a de Polignac number, because 55666015 - 2⁵ = 55665983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5566597 + ... + 5566606.

It is an arithmetic number, because the mean of its divisors is an integer number (16699806).

Almost surely, 2^55666015 is an apocalyptic number.

55666015 is a deficient number, since it is larger than the sum of its proper divisors (11133209).

55666015 is a wasteful number, since it uses less digits than its factorization.

55666015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11133208.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 55666015 is about 7460.9660902594. The cubic root of 55666015 is about 381.8241357640.

The spelling of 55666015 in words is "fifty-five million, six hundred sixty-six thousand, fifteen".