4243966646009 has 2 divisors, whose sum is σ = 4243966646010. Its totient is φ = 4243966646008.

The previous prime is 4243966645973. The next prime is 4243966646041. The reversal of 4243966646009 is 9006466693424.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3530190054400 + 713776591609 = 1878880^2 + 844853^2 .

It is a cyclic number.

It is not a de Polignac number, because 4243966646009 - 2²⁰ = 4243965597433 is a prime.

It is a super-2 number, since 2×4243966646009² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4243966646089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121983323004 + 2121983323005.

It is an arithmetic number, because the mean of its divisors is an integer number (2121983323005).

Almost surely, 2^{4243966646009} is an apocalyptic number.

It is an amenable number.

4243966646009 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243966646009 is an equidigital number, since it uses as much as digits as its factorization.

4243966646009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40310784, while the sum is 59.

The spelling of 4243966646009 in words is "four trillion, two hundred forty-three billion, nine hundred sixty-six million, six hundred forty-six thousand, nine".