11661560 has 16 divisors (see below), whose sum is σ = 26238600. Its totient is φ = 4664608.

The previous prime is 11661547. The next prime is 11661563. The reversal of 11661560 is 6516611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145730 + ... + 145809.

Almost surely, 2^11661560 is an apocalyptic number.

11661560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11661560 is an abundant number, since it is smaller than the sum of its proper divisors (14577040).

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

11661560 is a wasteful number, since it uses less digits than its factorization.

11661560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291550 (or 291546 counting only the distinct ones).

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

The square root of 11661560 is about 3414.9026340439. The cubic root of 11661560 is about 226.7699740544.

It can be divided in two parts, 11661 and 560, that added together give a palindrome (12221).

The spelling of 11661560 in words is "eleven million, six hundred sixty-one thousand, five hundred sixty".