12500661 has 16 divisors (see below), whose sum is σ = 18417024. Its totient is φ = 7501824.

The previous prime is 12500647. The next prime is 12500693. The reversal of 12500661 is 16600521.

It is a happy number.

12500661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12500661 - 2⁵ = 12500629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12502661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4156 + ... + 6501.

It is an arithmetic number, because the mean of its divisors is an integer number (1151064).

Almost surely, 2^12500661 is an apocalyptic number.

It is an amenable number.

12500661 is a deficient number, since it is larger than the sum of its proper divisors (5916363).

12500661 is a wasteful number, since it uses less digits than its factorization.

12500661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10700.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 12500661 is about 3535.6273842134. The cubic root of 12500661 is about 232.0835323955.

The spelling of 12500661 in words is "twelve million, five hundred thousand, six hundred sixty-one".