4543638651509 has 2 divisors, whose sum is σ = 4543638651510. Its totient is φ = 4543638651508.

The previous prime is 4543638651389. The next prime is 4543638651511. The reversal of 4543638651509 is 9051568363454.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4434722150884 + 108916500625 = 2105878^2 + 330025^2 .

It is a cyclic number.

It is not a de Polignac number, because 4543638651509 - 2²⁸ = 4543370216053 is a prime.

Together with 4543638651511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4543638651709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2271819325754 + 2271819325755.

It is an arithmetic number, because the mean of its divisors is an integer number (2271819325755).

Almost surely, 2^{4543638651509} is an apocalyptic number.

It is an amenable number.

4543638651509 is a deficient number, since it is larger than the sum of its proper divisors (1).

4543638651509 is an equidigital number, since it uses as much as digits as its factorization.

4543638651509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656000, while the sum is 59.

The spelling of 4543638651509 in words is "four trillion, five hundred forty-three billion, six hundred thirty-eight million, six hundred fifty-one thousand, five hundred nine".