11605216685 has 16 divisors (see below), whose sum is σ = 15143981616. Its totient is φ = 8501879808.

The previous prime is 11605216681. The next prime is 11605216687. The reversal of 11605216685 is 58661250611.

It can be written as a sum of positive squares in 8 ways, for example, as 3276646564 + 8328570121 = 57242^2 + 91261^2 .

It is a cyclic number.

It is not a de Polignac number, because 11605216685 - 2² = 11605216681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11605216681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1841882 + ... + 1848171.

It is an arithmetic number, because the mean of its divisors is an integer number (946498851).

Almost surely, 2^11605216685 is an apocalyptic number.

It is an amenable number.

11605216685 is a deficient number, since it is larger than the sum of its proper divisors (3538764931).

11605216685 is a wasteful number, since it uses less digits than its factorization.

11605216685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690112.

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 11605216685 in words is "eleven billion, six hundred five million, two hundred sixteen thousand, six hundred eighty-five".