12565155 has 8 divisors (see below), whose sum is σ = 20104272. Its totient is φ = 6701408.

The previous prime is 12565139. The next prime is 12565169. The reversal of 12565155 is 55156521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12565155 - 2⁴ = 12565139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418824 + ... + 418853.

It is an arithmetic number, because the mean of its divisors is an integer number (2513034).

Almost surely, 2^12565155 is an apocalyptic number.

12565155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12565155 is a deficient number, since it is larger than the sum of its proper divisors (7539117).

12565155 is an equidigital number, since it uses as much as digits as its factorization.

12565155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837685.

The product of its digits is 7500, while the sum is 30.

The square root of 12565155 is about 3544.7362384245. The cubic root of 12565155 is about 232.4819733971.

It can be divided in two parts, 12565 and 155, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 12565155 in words is "twelve million, five hundred sixty-five thousand, one hundred fifty-five".