55666615 has 8 divisors (see below), whose sum is σ = 67797360. Its totient is φ = 43868352.

The previous prime is 55666613. The next prime is 55666621. The reversal of 55666615 is 51666655.

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 55666615 - 2¹ = 55666613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55666613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82750 + ... + 83419.

It is an arithmetic number, because the mean of its divisors is an integer number (8474670).

Almost surely, 2^55666615 is an apocalyptic number.

55666615 is a deficient number, since it is larger than the sum of its proper divisors (12130745).

55666615 is a wasteful number, since it uses less digits than its factorization.

55666615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166241.

The product of its digits is 162000, while the sum is 40.

The square root of 55666615 is about 7461.0062994210. The cubic root of 55666615 is about 381.8255075984.

Adding to 55666615 its sum of digits (40), we get a palindrome (55666655).

The spelling of 55666615 in words is "fifty-five million, six hundred sixty-six thousand, six hundred fifteen".