9645455509 has 2 divisors, whose sum is σ = 9645455510. Its totient is φ = 9645455508.

The previous prime is 9645455441. The next prime is 9645455551. The reversal of 9645455509 is 9055545469.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8292834225 + 1352621284 = 91065^2 + 36778^2 .

It is an emirp because it is prime and its reverse (9055545469) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9645455509 - 2²¹ = 9643358357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9645455579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4822727754 + 4822727755.

It is an arithmetic number, because the mean of its divisors is an integer number (4822727755).

Almost surely, 2^9645455509 is an apocalyptic number.

It is an amenable number.

9645455509 is a deficient number, since it is larger than the sum of its proper divisors (1).

9645455509 is an equidigital number, since it uses as much as digits as its factorization.

9645455509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860000, while the sum is 52.

The square root of 9645455509 is about 98211.2799478756. The cubic root of 9645455509 is about 2128.6662805581. Note that the first 3 decimals are identical.

The spelling of 9645455509 in words is "nine billion, six hundred forty-five million, four hundred fifty-five thousand, five hundred nine".