11656423203 has 4 divisors (see below), whose sum is σ = 15541897608. Its totient is φ = 7770948800.

The previous prime is 11656423199. The next prime is 11656423271. The reversal of 11656423203 is 30232465611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11656423203 - 2² = 11656423199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11656423003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1942737198 + ... + 1942737203.

It is an arithmetic number, because the mean of its divisors is an integer number (3885474402).

Almost surely, 2^11656423203 is an apocalyptic number.

11656423203 is a deficient number, since it is larger than the sum of its proper divisors (3885474405).

11656423203 is an equidigital number, since it uses as much as digits as its factorization.

11656423203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885474404.

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 11656423203 its reverse (30232465611), we get a palindrome (41888888814).

The spelling of 11656423203 in words is "eleven billion, six hundred fifty-six million, four hundred twenty-three thousand, two hundred three".