11781185123 has 4 divisors (see below), whose sum is σ = 11782118400. Its totient is φ = 11780251848.

The previous prime is 11781185093. The next prime is 11781185167. The reversal of 11781185123 is 32158118711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32158118711 = 911 ⋅35299801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11781185123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11781181123) 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, 447440 + ... + 473037.

It is an arithmetic number, because the mean of its divisors is an integer number (2945529600).

Almost surely, 2^11781185123 is an apocalyptic number.

11781185123 is a deficient number, since it is larger than the sum of its proper divisors (933277).

11781185123 is an equidigital number, since it uses as much as digits as its factorization.

11781185123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933276.

The product of its digits is 13440, while the sum is 38.

The spelling of 11781185123 in words is "eleven billion, seven hundred eighty-one million, one hundred eighty-five thousand, one hundred twenty-three".