12565400001 has 64 divisors (see below), whose sum is σ = 21273864192. Its totient is φ = 6461400000.

The previous prime is 12565399993. The next prime is 12565400041. The reversal of 12565400001 is 10000456521.

It is not a de Polignac number, because 12565400001 - 2³ = 12565399993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12565400041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2820826 + ... + 2825276.

It is an arithmetic number, because the mean of its divisors is an integer number (332404128).

Almost surely, 2^12565400001 is an apocalyptic number.

12565400001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12565400001 is a deficient number, since it is larger than the sum of its proper divisors (8708464191).

12565400001 is a wasteful number, since it uses less digits than its factorization.

12565400001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4595 (or 4573 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 12565400001 its reverse (10000456521), we get a palindrome (22565856522).

The spelling of 12565400001 in words is "twelve billion, five hundred sixty-five million, four hundred thousand, one".