12565145504101 has 4 divisors (see below), whose sum is σ = 12582867853900. Its totient is φ = 12547423154304.

The previous prime is 12565145504099. The next prime is 12565145504123. The reversal of 12565145504101 is 10140554156521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1478583040900 + 11086562463201 = 1215970^2 + 3329649^2 .

It is a cyclic number.

It is not a de Polignac number, because 12565145504101 - 2¹ = 12565145504099 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 (12565145504501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8861173836 + ... + 8861175253.

It is an arithmetic number, because the mean of its divisors is an integer number (3145716963475).

Almost surely, 2^{12565145504101} is an apocalyptic number.

It is an amenable number.

12565145504101 is a deficient number, since it is larger than the sum of its proper divisors (17722349799).

12565145504101 is an equidigital number, since it uses as much as digits as its factorization.

12565145504101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17722349798.

The product of its (nonzero) digits is 120000, while the sum is 40.

The spelling of 12565145504101 in words is "twelve trillion, five hundred sixty-five billion, one hundred forty-five million, five hundred four thousand, one hundred one".