12665555 has 8 divisors (see below), whose sum is σ = 17369952. Its totient is φ = 8684928.

The previous prime is 12665531. The next prime is 12665557. The reversal of 12665555 is 55556621.

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

It is not a de Polignac number, because 12665555 - 2¹⁴ = 12649171 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 361873 = 12665555 / (1 + 2 + 6 + 6 + 5 + 5 + 5 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12665557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180902 + ... + 180971.

It is an arithmetic number, because the mean of its divisors is an integer number (2171244).

Almost surely, 2^12665555 is an apocalyptic number.

12665555 is a deficient number, since it is larger than the sum of its proper divisors (4704397).

12665555 is an equidigital number, since it uses as much as digits as its factorization.

12665555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361885.

The product of its digits is 45000, while the sum is 35.

The square root of 12665555 is about 3558.8699048996. The cubic root of 12665555 is about 233.0995356566.

The spelling of 12665555 in words is "twelve million, six hundred sixty-five thousand, five hundred fifty-five".