6656276655409 has 4 divisors (see below), whose sum is σ = 6885803436660. Its totient is φ = 6426749874160.

The previous prime is 6656276655359. The next prime is 6656276655433. The reversal of 6656276655409 is 9045566726566.

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 3765528607009 + 2890748048400 = 1940497^2 + 1700220^2 .

It is a cyclic number.

It is not a de Polignac number, because 6656276655409 - 2²⁹ = 6655739784497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6656276655439) 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, 114763390582 + ... + 114763390639.

It is an arithmetic number, because the mean of its divisors is an integer number (1721450859165).

Almost surely, 2^{6656276655409} is an apocalyptic number.

It is an amenable number.

6656276655409 is a deficient number, since it is larger than the sum of its proper divisors (229526781251).

6656276655409 is a wasteful number, since it uses less digits than its factorization.

6656276655409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229526781250.

The product of its (nonzero) digits is 489888000, while the sum is 67.

The spelling of 6656276655409 in words is "six trillion, six hundred fifty-six billion, two hundred seventy-six million, six hundred fifty-five thousand, four hundred nine".