11556312403 has 4 divisors (see below), whose sum is σ = 11556620920. Its totient is φ = 11556003888.

The previous prime is 11556312329. The next prime is 11556312413. The reversal of 11556312403 is 30421365511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30421365511 = 563 ⋅54034397.

It is a cyclic number.

It is not a de Polignac number, because 11556312403 - 2³³ = 2966377811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11556312413) 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, 88818 + ... + 176071.

It is an arithmetic number, because the mean of its divisors is an integer number (2889155230).

Almost surely, 2^11556312403 is an apocalyptic number.

11556312403 is a deficient number, since it is larger than the sum of its proper divisors (308517).

11556312403 is an equidigital number, since it uses as much as digits as its factorization.

11556312403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308516.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 11556312403 its reverse (30421365511), we get a palindrome (41977677914).

The spelling of 11556312403 in words is "eleven billion, five hundred fifty-six million, three hundred twelve thousand, four hundred three".