12565670220400 has 120 divisors (see below), whose sum is σ = 33192799524864. Its totient is φ = 4533355411200.

The previous prime is 12565670220373. The next prime is 12565670220403. The reversal of 12565670220400 is 402207656521.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12565670220403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10684642 + ... + 11802241.

Almost surely, 2^{12565670220400} is an apocalyptic number.

12565670220400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12565670220400 is an abundant number, since it is smaller than the sum of its proper divisors (20627129304464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12565670220400 is a wasteful number, since it uses less digits than its factorization.

12565670220400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22487039 (or 22487028 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

Adding to 12565670220400 its reverse (402207656521), we get a palindrome (12967877876921).

The spelling of 12565670220400 in words is "twelve trillion, five hundred sixty-five billion, six hundred seventy million, two hundred twenty thousand, four hundred".