43385516305709 has 2 divisors, whose sum is σ = 43385516305710. Its totient is φ = 43385516305708.

The previous prime is 43385516305613. The next prime is 43385516305711. The reversal of 43385516305709 is 90750361558334.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36703265455684 + 6682250850025 = 6058322^2 + 2585005^2 .

It is a cyclic number.

It is not a de Polignac number, because 43385516305709 - 2²⁸ = 43385247870253 is a prime.

It is a super-2 number, since 2×43385516305709² (a number of 28 digits) contains 22 as substring.

Together with 43385516305711, 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 (43385516301709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21692758152854 + 21692758152855.

It is an arithmetic number, because the mean of its divisors is an integer number (21692758152855).

Almost surely, 2^{43385516305709} is an apocalyptic number.

It is an amenable number.

43385516305709 is a deficient number, since it is larger than the sum of its proper divisors (1).

43385516305709 is an equidigital number, since it uses as much as digits as its factorization.

43385516305709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824000, while the sum is 59.

The spelling of 43385516305709 in words is "forty-three trillion, three hundred eighty-five billion, five hundred sixteen million, three hundred five thousand, seven hundred nine".