656270709121 has 4 divisors (see below), whose sum is σ = 656487804672. Its totient is φ = 656053613572.

The previous prime is 656270709071. The next prime is 656270709191. The reversal of 656270709121 is 121907072656.

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 656270709121 - 2¹³ = 656270700929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656270709191) 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, 108543241 + ... + 108549286.

It is an arithmetic number, because the mean of its divisors is an integer number (164121951168).

Almost surely, 2^656270709121 is an apocalyptic number.

It is an amenable number.

656270709121 is a deficient number, since it is larger than the sum of its proper divisors (217095551).

656270709121 is a wasteful number, since it uses less digits than its factorization.

656270709121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217095550.

The product of its (nonzero) digits is 317520, while the sum is 46.

The spelling of 656270709121 in words is "six hundred fifty-six billion, two hundred seventy million, seven hundred nine thousand, one hundred twenty-one".