655646555 has 4 divisors (see below), whose sum is σ = 786775872. Its totient is φ = 524517240.

The previous prime is 655646513. The next prime is 655646557. The reversal of 655646555 is 555646556.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 655646555 - 2⁶ = 655646491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655646557) 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 3 ways as a sum of consecutive naturals, for example, 65564651 + ... + 65564660.

It is an arithmetic number, because the mean of its divisors is an integer number (196693968).

Almost surely, 2^655646555 is an apocalyptic number.

655646555 is a deficient number, since it is larger than the sum of its proper divisors (131129317).

655646555 is a wasteful number, since it uses less digits than its factorization.

655646555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131129316.

The product of its digits is 2700000, while the sum is 47.

The square root of 655646555 is about 25605.5961656822. The cubic root of 655646555 is about 868.7402187881.

Subtracting from 655646555 its reverse (555646556), we obtain a palindrome (99999999).

The spelling of 655646555 in words is "six hundred fifty-five million, six hundred forty-six thousand, five hundred fifty-five".