11523745413509 has 16 divisors (see below), whose sum is σ = 13743747234048. Its totient is φ = 9447253212672.

The previous prime is 11523745413487. The next prime is 11523745413511. The reversal of 11523745413509 is 90531454732511.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11523745413509 - 2²⁸ = 11523476978053 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 (11523745413109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1035212 + ... + 4911125.

It is an arithmetic number, because the mean of its divisors is an integer number (858984202128).

Almost surely, 2^{11523745413509} is an apocalyptic number.

It is an amenable number.

11523745413509 is a deficient number, since it is larger than the sum of its proper divisors (2220001820539).

11523745413509 is a wasteful number, since it uses less digits than its factorization.

11523745413509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5958404.

The product of its (nonzero) digits is 2268000, while the sum is 50.

The spelling of 11523745413509 in words is "eleven trillion, five hundred twenty-three billion, seven hundred forty-five million, four hundred thirteen thousand, five hundred nine".