12566001 has 24 divisors (see below), whose sum is σ = 19773984. Its totient is φ = 7076160.

The previous prime is 12565991. The next prime is 12566003. The reversal of 12566001 is 10066521.

It is a happy number.

It is not a de Polignac number, because 12566001 - 2⁶ = 12565937 is a prime.

It is a super-2 number, since 2×12566001² = 315808762264002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (12566003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10146 + ... + 11316.

It is an arithmetic number, because the mean of its divisors is an integer number (823916).

Almost surely, 2^12566001 is an apocalyptic number.

It is an amenable number.

12566001 is a deficient number, since it is larger than the sum of its proper divisors (7207983).

12566001 is a wasteful number, since it uses less digits than its factorization.

12566001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261 (or 1254 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 12566001 is about 3544.8555682848. The cubic root of 12566001 is about 232.4871908772.

The spelling of 12566001 in words is "twelve million, five hundred sixty-six thousand, one".