4256734440209 has 2 divisors, whose sum is σ = 4256734440210. Its totient is φ = 4256734440208.

The previous prime is 4256734440137. The next prime is 4256734440241. The reversal of 4256734440209 is 9020444376524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4085867950609 + 170866489600 = 2021353^2 + 413360^2 .

It is a cyclic number.

It is not a de Polignac number, because 4256734440209 - 2¹² = 4256734436113 is a prime.

It is a super-2 number, since 2×4256734440209² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4256734440709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2128367220104 + 2128367220105.

It is an arithmetic number, because the mean of its divisors is an integer number (2128367220105).

Almost surely, 2^{4256734440209} is an apocalyptic number.

It is an amenable number.

4256734440209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4256734440209 is an equidigital number, since it uses as much as digits as its factorization.

4256734440209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 50.

The spelling of 4256734440209 in words is "four trillion, two hundred fifty-six billion, seven hundred thirty-four million, four hundred forty thousand, two hundred nine".