11913985305 has 32 divisors (see below), whose sum is σ = 22426329600. Its totient is φ = 5980352256.

The previous prime is 11913985301. The next prime is 11913985309. The reversal of 11913985305 is 50358931911.

11913985305 is a `hidden beast` number, since 1 + 19 + 13 + 98 + 530 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (11913985301) and next prime (11913985309).

It is not a de Polignac number, because 11913985305 - 2² = 11913985301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (11913985301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2593345 + ... + 2597934.

It is an arithmetic number, because the mean of its divisors is an integer number (700822800).

Almost surely, 2^11913985305 is an apocalyptic number.

11913985305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11913985305 is a deficient number, since it is larger than the sum of its proper divisors (10512344295).

11913985305 is a wasteful number, since it uses less digits than its factorization.

11913985305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5191310 (or 5191304 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 45.

The spelling of 11913985305 in words is "eleven billion, nine hundred thirteen million, nine hundred eighty-five thousand, three hundred five".