12557645 has 16 divisors (see below), whose sum is σ = 16074288. Its totient is φ = 9384960.

The previous prime is 12557641. The next prime is 12557647. The reversal of 12557645 is 54675521.

It can be written as a sum of positive squares in 8 ways, for example, as 11881 + 12545764 = 109^2 + 3542^2 .

It is not a de Polignac number, because 12557645 - 2² = 12557641 is a prime.

It is a super-3 number, since 3×12557645³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12557641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12875 + ... + 13815.

It is an arithmetic number, because the mean of its divisors is an integer number (1004643).

Almost surely, 2^12557645 is an apocalyptic number.

It is an amenable number.

12557645 is a deficient number, since it is larger than the sum of its proper divisors (3516643).

12557645 is a wasteful number, since it uses less digits than its factorization.

12557645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120.

The product of its digits is 42000, while the sum is 35.

The square root of 12557645 is about 3543.6767629117. The cubic root of 12557645 is about 232.4356471991.

The spelling of 12557645 in words is "twelve million, five hundred fifty-seven thousand, six hundred forty-five".