11605321872 has 40 divisors (see below), whose sum is σ = 33311573280. Its totient is φ = 3868440480.

The previous prime is 11605321841. The next prime is 11605321891. The reversal of 11605321872 is 27812350611.

11605321872 is a `hidden beast` number, since 1 + 1 + 605 + 32 + 18 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13431654 + ... + 13432517.

It is an arithmetic number, because the mean of its divisors is an integer number (832789332).

Almost surely, 2^11605321872 is an apocalyptic number.

11605321872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11605321872 is an abundant number, since it is smaller than the sum of its proper divisors (21706251408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11605321872 is a wasteful number, since it uses less digits than its factorization.

11605321872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26864188 (or 26864176 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 11605321872 in words is "eleven billion, six hundred five million, three hundred twenty-one thousand, eight hundred seventy-two".