11523031655 has 4 divisors (see below), whose sum is σ = 13827637992. Its totient is φ = 9218425320.

The previous prime is 11523031609. The next prime is 11523031657. The reversal of 11523031655 is 55613032511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55613032511 = 241 ⋅230759471.

It is not a de Polignac number, because 11523031655 - 2²⁴ = 11506254439 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 (11523031657) 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, 1152303161 + ... + 1152303170.

It is an arithmetic number, because the mean of its divisors is an integer number (3456909498).

Almost surely, 2^11523031655 is an apocalyptic number.

11523031655 is a deficient number, since it is larger than the sum of its proper divisors (2304606337).

11523031655 is an equidigital number, since it uses as much as digits as its factorization.

11523031655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304606336.

The product of its (nonzero) digits is 13500, while the sum is 32.

The spelling of 11523031655 in words is "eleven billion, five hundred twenty-three million, thirty-one thousand, six hundred fifty-five".