11685561700 has 144 divisors (see below), whose sum is σ = 27450493056. Its totient is φ = 4306508800.

The previous prime is 11685561689. The next prime is 11685561703. The reversal of 11685561700 is 716558611.

It is not an unprimeable number, because it can be changed into a prime (11685561703) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7826154 + ... + 7827646.

It is an arithmetic number, because the mean of its divisors is an integer number (190628424).

Almost surely, 2^11685561700 is an apocalyptic number.

11685561700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11685561700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13725246528).

11685561700 is an abundant number, since it is smaller than the sum of its proper divisors (15764931356).

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

11685561700 is a wasteful number, since it uses less digits than its factorization.

11685561700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654 (or 1647 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 40.

The spelling of 11685561700 in words is "eleven billion, six hundred eighty-five million, five hundred sixty-one thousand, seven hundred".