655605605 has 4 divisors (see below), whose sum is σ = 786726732. Its totient is φ = 524484480.

The previous prime is 655605589. The next prime is 655605607. The reversal of 655605605 is 506506556.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 499880164 + 155725441 = 22358^2 + 12479^2 .

It is not a de Polignac number, because 655605605 - 2⁴ = 655605589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655605607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65560556 + ... + 65560565.

It is an arithmetic number, because the mean of its divisors is an integer number (196681683).

Almost surely, 2^655605605 is an apocalyptic number.

It is an amenable number.

655605605 is a deficient number, since it is larger than the sum of its proper divisors (131121127).

655605605 is a wasteful number, since it uses less digits than its factorization.

655605605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131121126.

The product of its (nonzero) digits is 135000, while the sum is 38.

The square root of 655605605 is about 25604.7965233079. The cubic root of 655605605 is about 868.7221319839.

The spelling of 655605605 in words is "six hundred fifty-five million, six hundred five thousand, six hundred five".