655658856557 has 4 divisors (see below), whose sum is σ = 655663181376. Its totient is φ = 655654531740.

The previous prime is 655658856529. The next prime is 655658856613. The reversal of 655658856557 is 755658856556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 655658856557 - 2²⁶ = 655591747693 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 (655658852557) 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, 1926419 + ... + 2241072.

It is an arithmetic number, because the mean of its divisors is an integer number (163915795344).

Almost surely, 2^655658856557 is an apocalyptic number.

It is an amenable number.

655658856557 is a deficient number, since it is larger than the sum of its proper divisors (4324819).

655658856557 is a wasteful number, since it uses less digits than its factorization.

655658856557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4324818.

The product of its digits is 1512000000, while the sum is 71.

Subtracting 655658856557 from its reverse (755658856556), we obtain a palindrome (99999999999).

The spelling of 655658856557 in words is "six hundred fifty-five billion, six hundred fifty-eight million, eight hundred fifty-six thousand, five hundred fifty-seven".