23511444553213 has 4 divisors (see below), whose sum is σ = 24894470703420. Its totient is φ = 22128418403008.

The previous prime is 23511444553187. The next prime is 23511444553253. The reversal of 23511444553213 is 31235544411532.

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 18644752653849 + 4866691899364 = 4317957^2 + 2206058^2 .

It is a cyclic number.

It is not a de Polignac number, because 23511444553213 - 2²⁵ = 23511410998781 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23511444553213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23511444553253) 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, 691513075078 + ... + 691513075111.

It is an arithmetic number, because the mean of its divisors is an integer number (6223617675855).

Almost surely, 2^{23511444553213} is an apocalyptic number.

It is an amenable number.

23511444553213 is a deficient number, since it is larger than the sum of its proper divisors (1383026150207).

23511444553213 is a wasteful number, since it uses less digits than its factorization.

23511444553213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383026150206.

The product of its digits is 864000, while the sum is 43.

Adding to 23511444553213 its reverse (31235544411532), we get a palindrome (54746988964745).

The spelling of 23511444553213 in words is "twenty-three trillion, five hundred eleven billion, four hundred forty-four million, five hundred fifty-three thousand, two hundred thirteen".