655599009 has 32 divisors (see below), whose sum is σ = 1002153600. Its totient is φ = 377879040.

The previous prime is 655598987. The next prime is 655599053. The reversal of 655599009 is 900995556.

It is not a de Polignac number, because 655599009 - 2⁸ = 655598753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (655599059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60979 + ... + 70919.

It is an arithmetic number, because the mean of its divisors is an integer number (31317300).

Almost surely, 2^655599009 is an apocalyptic number.

It is an amenable number.

655599009 is a deficient number, since it is larger than the sum of its proper divisors (346554591).

655599009 is a wasteful number, since it uses less digits than its factorization.

655599009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10065.

The product of its (nonzero) digits is 546750, while the sum is 48.

The square root of 655599009 is about 25604.6677189922. The cubic root of 655599009 is about 868.7192185909.

The spelling of 655599009 in words is "six hundred fifty-five million, five hundred ninety-nine thousand, nine".