655656985 has 4 divisors (see below), whose sum is σ = 786788388. Its totient is φ = 524525584.

The previous prime is 655656977. The next prime is 655657001. The reversal of 655656985 is 589656556.

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 196112016 + 459544969 = 14004^2 + 21437^2 .

It is a cyclic number.

It is not a de Polignac number, because 655656985 - 2³ = 655656977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65565694 + ... + 65565703.

It is an arithmetic number, because the mean of its divisors is an integer number (196697097).

Almost surely, 2^655656985 is an apocalyptic number.

It is an amenable number.

655656985 is a deficient number, since it is larger than the sum of its proper divisors (131131403).

655656985 is a wasteful number, since it uses less digits than its factorization.

655656985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131131402.

The product of its digits is 9720000, while the sum is 55.

The square root of 655656985 is about 25605.7998312882. The cubic root of 655656985 is about 868.7448253923.

The spelling of 655656985 in words is "six hundred fifty-five million, six hundred fifty-six thousand, nine hundred eighty-five".