2256520211009 has 2 divisors, whose sum is σ = 2256520211010. Its totient is φ = 2256520211008.

The previous prime is 2256520210981. The next prime is 2256520211083. The reversal of 2256520211009 is 9001120256522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2220910633984 + 35609577025 = 1490272^2 + 188705^2 .

It is a cyclic number.

It is not a de Polignac number, because 2256520211009 - 2⁴⁰ = 1157008583233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2256520211009.

It is not a weakly prime, because it can be changed into another prime (2256520216009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128260105504 + 1128260105505.

It is an arithmetic number, because the mean of its divisors is an integer number (1128260105505).

Almost surely, 2^{2256520211009} is an apocalyptic number.

It is an amenable number.

2256520211009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2256520211009 is an equidigital number, since it uses as much as digits as its factorization.

2256520211009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 2256520211009 in words is "two trillion, two hundred fifty-six billion, five hundred twenty million, two hundred eleven thousand, nine".