7145665409 has 2 divisors, whose sum is σ = 7145665410. Its totient is φ = 7145665408.

The previous prime is 7145665393. The next prime is 7145665411. The reversal of 7145665409 is 9045665417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7077520384 + 68145025 = 84128^2 + 8255^2 .

It is a cyclic number.

It is not a de Polignac number, because 7145665409 - 2⁴ = 7145665393 is a prime.

Together with 7145665411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7145665459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3572832704 + 3572832705.

It is an arithmetic number, because the mean of its divisors is an integer number (3572832705).

Almost surely, 2^7145665409 is an apocalyptic number.

It is an amenable number.

7145665409 is a deficient number, since it is larger than the sum of its proper divisors (1).

7145665409 is an equidigital number, since it uses as much as digits as its factorization.

7145665409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 47.

The square root of 7145665409 is about 84532.0377667544. The cubic root of 7145665409 is about 1926.1091406776.

The spelling of 7145665409 in words is "seven billion, one hundred forty-five million, six hundred sixty-five thousand, four hundred nine".