11963839509 has 8 divisors (see below), whose sum is σ = 17724206720. Its totient is φ = 7975892988.

The previous prime is 11963839477. The next prime is 11963839543. The reversal of 11963839509 is 90593836911.

11963839509 is a `hidden beast` number, since 11 + 96 + 3 + 8 + 39 + 509 = 666.

It is not a de Polignac number, because 11963839509 - 2⁵ = 11963839477 is a prime.

It is a super-2 number, since 2×11963839509² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11963849509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221552557 + ... + 221552610.

It is an arithmetic number, because the mean of its divisors is an integer number (2215525840).

Almost surely, 2^11963839509 is an apocalyptic number.

It is an amenable number.

11963839509 is a deficient number, since it is larger than the sum of its proper divisors (5760367211).

11963839509 is an equidigital number, since it uses as much as digits as its factorization.

11963839509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443105176 (or 443105170 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The spelling of 11963839509 in words is "eleven billion, nine hundred sixty-three million, eight hundred thirty-nine thousand, five hundred nine".