1245505505209 has 16 divisors (see below), whose sum is σ = 1441709867520. Its totient is φ = 1053874710720.

The previous prime is 1245505505203. The next prime is 1245505505219. The reversal of 1245505505209 is 9025055055421.

It is a cyclic number.

It is not a de Polignac number, because 1245505505209 - 2⁷ = 1245505505081 is a prime.

It is a super-2 number, since 2×1245505505209² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245505505203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2950419 + ... + 3346039.

It is an arithmetic number, because the mean of its divisors is an integer number (90106866720).

Almost surely, 2^{1245505505209} is an apocalyptic number.

It is an amenable number.

1245505505209 is a deficient number, since it is larger than the sum of its proper divisors (196204362311).

1245505505209 is an equidigital number, since it uses as much as digits as its factorization.

1245505505209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401400.

The product of its (nonzero) digits is 450000, while the sum is 43.

The spelling of 1245505505209 in words is "one trillion, two hundred forty-five billion, five hundred five million, five hundred five thousand, two hundred nine".