11561660 has 24 divisors (see below), whose sum is σ = 26487216. Its totient is φ = 4204160.

The previous prime is 11561653. The next prime is 11561681. The reversal of 11561660 is 6616511.

11561660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 26057 + ... + 26496.

It is an arithmetic number, because the mean of its divisors is an integer number (1103634).

Almost surely, 2^11561660 is an apocalyptic number.

11561660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11561660 is an abundant number, since it is smaller than the sum of its proper divisors (14925556).

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

11561660 is a wasteful number, since it uses less digits than its factorization.

11561660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52573 (or 52571 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 11561660 is about 3400.2441088839. The cubic root of 11561660 is about 226.1205663630.

It can be divided in two parts, 11561 and 660, that added together give a palindrome (12221).

The spelling of 11561660 in words is "eleven million, five hundred sixty-one thousand, six hundred sixty".