23513543505 has 48 divisors (see below), whose sum is σ = 42597107280. Its totient is φ = 11983233024.

The previous prime is 23513543503. The next prime is 23513543507. The reversal of 23513543505 is 50534531532.

It is an interprime number because it is at equal distance from previous prime (23513543503) and next prime (23513543507).

It can be written as a sum of positive squares in 8 ways, for example, as 4192821504 + 19320722001 = 64752^2 + 138999^2 .

It is not a de Polignac number, because 23513543505 - 2¹ = 23513543503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23513543505.

It is not an unprimeable number, because it can be changed into a prime (23513543503) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33709 + ... + 219461.

It is an arithmetic number, because the mean of its divisors is an integer number (887439735).

Almost surely, 2^23513543505 is an apocalyptic number.

It is an amenable number.

23513543505 is a deficient number, since it is larger than the sum of its proper divisors (19083563775).

23513543505 is a wasteful number, since it uses less digits than its factorization.

23513543505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185890 (or 185887 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 36.

The spelling of 23513543505 in words is "twenty-three billion, five hundred thirteen million, five hundred forty-three thousand, five hundred five".