8145655909 has 2 divisors, whose sum is σ = 8145655910. Its totient is φ = 8145655908.

The previous prime is 8145655897. The next prime is 8145655993. The reversal of 8145655909 is 9095565418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7625131684 + 520524225 = 87322^2 + 22815^2 .

It is a cyclic number.

It is not a de Polignac number, because 8145655909 - 2³¹ = 5998172261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8145652909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4072827954 + 4072827955.

It is an arithmetic number, because the mean of its divisors is an integer number (4072827955).

Almost surely, 2^8145655909 is an apocalyptic number.

It is an amenable number.

8145655909 is a deficient number, since it is larger than the sum of its proper divisors (1).

8145655909 is an equidigital number, since it uses as much as digits as its factorization.

8145655909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 52.

The square root of 8145655909 is about 90253.2875246104. The cubic root of 8145655909 is about 2012.0650631868.

The spelling of 8145655909 in words is "eight billion, one hundred forty-five million, six hundred fifty-five thousand, nine hundred nine".