11605505616 has 30 divisors (see below), whose sum is σ = 32479297370. Its totient is φ = 3868501824.

The previous prime is 11605505591. The next prime is 11605505647. The reversal of 11605505616 is 61650550611.

It can be written as a sum of positive squares in only one way, i.e., 9119486016 + 2486019600 = 95496^2 + 49860^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40296751 + ... + 40297038.

Almost surely, 2^11605505616 is an apocalyptic number.

11605505616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11605505616 is an abundant number, since it is smaller than the sum of its proper divisors (20873791754).

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

11605505616 is a wasteful number, since it uses less digits than its factorization.

11605505616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80593803 (or 80593794 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 11605505616 in words is "eleven billion, six hundred five million, five hundred five thousand, six hundred sixteen".