655666555 has 8 divisors (see below), whose sum is σ = 786999744. Its totient is φ = 524400000.

The previous prime is 655666511. The next prime is 655666559. The reversal of 655666555 is 555666556.

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

It is not a de Polignac number, because 655666555 - 2¹¹ = 655664507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 655666499 and 655666508.

It is not an unprimeable number, because it can be changed into a prime (655666559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8430 + ... + 37180.

It is an arithmetic number, because the mean of its divisors is an integer number (98374968).

Almost surely, 2^655666555 is an apocalyptic number.

655666555 is a deficient number, since it is larger than the sum of its proper divisors (131333189).

655666555 is a wasteful number, since it uses less digits than its factorization.

655666555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33317.

The product of its digits is 4050000, while the sum is 49.

The square root of 655666555 is about 25605.9867023319. The cubic root of 655666555 is about 868.7490521184.

Subtracting from 655666555 its reverse (555666556), we obtain a palindrome (99999999).

The spelling of 655666555 in words is "six hundred fifty-five million, six hundred sixty-six thousand, five hundred fifty-five".