12618557 has 4 divisors (see below), whose sum is σ = 14421216. Its totient is φ = 10815900.

The previous prime is 12618553. The next prime is 12618569. The reversal of 12618557 is 75581621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75581621 = 773 ⋅97777.

It is a cyclic number.

It is not a de Polignac number, because 12618557 - 2² = 12618553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12618553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 901319 + ... + 901332.

It is an arithmetic number, because the mean of its divisors is an integer number (3605304).

Almost surely, 2^12618557 is an apocalyptic number.

It is an amenable number.

12618557 is a deficient number, since it is larger than the sum of its proper divisors (1802659).

12618557 is an equidigital number, since it uses as much as digits as its factorization.

12618557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802658.

The product of its digits is 16800, while the sum is 35.

The square root of 12618557 is about 3552.2608293874. The cubic root of 12618557 is about 232.8108579408.

The spelling of 12618557 in words is "twelve million, six hundred eighteen thousand, five hundred fifty-seven".