12661515 has 48 divisors (see below), whose sum is σ = 24137568. Its totient is φ = 6345216.

The previous prime is 12661499. The next prime is 12661589. The reversal of 12661515 is 51516621.

It is a happy number.

It is not a de Polignac number, because 12661515 - 2⁴ = 12661499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20349 + ... + 20961.

It is an arithmetic number, because the mean of its divisors is an integer number (502866).

Almost surely, 2^12661515 is an apocalyptic number.

12661515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12661515 is a deficient number, since it is larger than the sum of its proper divisors (11476053).

12661515 is an equidigital number, since it uses as much as digits as its factorization.

12661515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 638 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 12661515 is about 3558.3022637207. The cubic root of 12661515 is about 233.0747486846.

The spelling of 12661515 in words is "twelve million, six hundred sixty-one thousand, five hundred fifteen".