12365661 has 32 divisors (see below), whose sum is σ = 20736000. Its totient is φ = 6367680.

The previous prime is 12365627. The next prime is 12365663. The reversal of 12365661 is 16656321.

It is not a de Polignac number, because 12365661 - 2⁶ = 12365597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12365663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45835 + ... + 46103.

It is an arithmetic number, because the mean of its divisors is an integer number (648000).

Almost surely, 2^12365661 is an apocalyptic number.

12365661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12365661 is a deficient number, since it is larger than the sum of its proper divisors (8370339).

12365661 is a wasteful number, since it uses less digits than its factorization.

12365661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its digits is 6480, while the sum is 30.

The square root of 12365661 is about 3516.4841816792. The cubic root of 12365661 is about 231.2450501984.

It can be divided in two parts, 1236 and 5661, that multiplied together give a palindrome (6996996).

The spelling of 12365661 in words is "twelve million, three hundred sixty-five thousand, six hundred sixty-one".