12661560 has 48 divisors (see below), whose sum is σ = 41151240. Its totient is φ = 3376320.

The previous prime is 12661499. The next prime is 12661589. The reversal of 12661560 is 6516621.

It is a happy number.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17226 + ... + 17945.

Almost surely, 2^12661560 is an apocalyptic number.

12661560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12661560 is an abundant number, since it is smaller than the sum of its proper divisors (28489680).

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

12661560 is a wasteful number, since it uses less digits than its factorization.

12661560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35188 (or 35181 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 12661560 is about 3558.3085869553. The cubic root of 12661560 is about 233.0750248061.

The spelling of 12661560 in words is "twelve million, six hundred sixty-one thousand, five hundred sixty".