6505211212009 has 2 divisors, whose sum is σ = 6505211212010. Its totient is φ = 6505211212008.

The previous prime is 6505211211943. The next prime is 6505211212033. The reversal of 6505211212009 is 9002121125056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6056348731225 + 448862480784 = 2460965^2 + 669972^2 .

It is a cyclic number.

It is not a de Polignac number, because 6505211212009 - 2⁷ = 6505211211881 is a prime.

It is not a weakly prime, because it can be changed into another prime (6505211212079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3252605606004 + 3252605606005.

It is an arithmetic number, because the mean of its divisors is an integer number (3252605606005).

Almost surely, 2^{6505211212009} is an apocalyptic number.

It is an amenable number.

6505211212009 is a deficient number, since it is larger than the sum of its proper divisors (1).

6505211212009 is an equidigital number, since it uses as much as digits as its factorization.

6505211212009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 6505211212009 in words is "six trillion, five hundred five billion, two hundred eleven million, two hundred twelve thousand, nine".