655656585656557 has 8 divisors (see below), whose sum is σ = 655742499955200. Its totient is φ = 655570672528464.

The previous prime is 655656585656549. The next prime is 655656585656561. The reversal of 655656585656557 is 755656585656556.

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

It is a cyclic number.

It is not a de Polignac number, because 655656585656557 - 2³ = 655656585656549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655656585656507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1964529744 + ... + 1964863462.

It is an arithmetic number, because the mean of its divisors is an integer number (81967812494400).

Almost surely, 2^{655656585656557} is an apocalyptic number.

It is an amenable number.

655656585656557 is a deficient number, since it is larger than the sum of its proper divisors (85914298643).

655656585656557 is a wasteful number, since it uses less digits than its factorization.

655656585656557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585275.

The product of its digits is 170100000000, while the sum is 85.

Subtracting 655656585656557 from its reverse (755656585656556), we obtain a palindrome (99999999999999).

The spelling of 655656585656557 in words is "six hundred fifty-five trillion, six hundred fifty-six billion, five hundred eighty-five million, six hundred fifty-six thousand, five hundred fifty-seven".