11985709835 has 16 divisors (see below), whose sum is σ = 16613348832. Its totient is φ = 8204121600.

The previous prime is 11985709823. The next prime is 11985709859. The reversal of 11985709835 is 53890758911.

It is not a de Polignac number, because 11985709835 - 2⁴ = 11985709819 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6408536 + ... + 6410405.

It is an arithmetic number, because the mean of its divisors is an integer number (1038334302).

Almost surely, 2^11985709835 is an apocalyptic number.

11985709835 is a deficient number, since it is larger than the sum of its proper divisors (4627638997).

11985709835 is a wasteful number, since it uses less digits than its factorization.

11985709835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12818974.

The product of its (nonzero) digits is 2721600, while the sum is 56.

The spelling of 11985709835 in words is "eleven billion, nine hundred eighty-five million, seven hundred nine thousand, eight hundred thirty-five".