656556115555 has 4 divisors (see below), whose sum is σ = 787867338672. Its totient is φ = 525244892440.

The previous prime is 656556115547. The next prime is 656556115559. The reversal of 656556115555 is 555511655656.

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

It is not a de Polignac number, because 656556115555 - 2³ = 656556115547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 656556115496 and 656556115505.

It is not an unprimeable number, because it can be changed into a prime (656556115559) 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, 65655611551 + ... + 65655611560.

It is an arithmetic number, because the mean of its divisors is an integer number (196966834668).

Almost surely, 2^656556115555 is an apocalyptic number.

656556115555 is a deficient number, since it is larger than the sum of its proper divisors (131311223117).

656556115555 is a wasteful number, since it uses less digits than its factorization.

656556115555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131311223116.

The product of its digits is 16875000, while the sum is 55.

The spelling of 656556115555 in words is "six hundred fifty-six billion, five hundred fifty-six million, one hundred fifteen thousand, five hundred fifty-five".