11415321553 has 4 divisors (see below), whose sum is σ = 11421437680. Its totient is φ = 11409205428.

The previous prime is 11415321523. The next prime is 11415321563. The reversal of 11415321553 is 35512351411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11415321553 - 2²¹ = 11413224401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11415321503) 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, 3055263 + ... + 3058996.

It is an arithmetic number, because the mean of its divisors is an integer number (2855359420).

Almost surely, 2^11415321553 is an apocalyptic number.

It is an amenable number.

11415321553 is a deficient number, since it is larger than the sum of its proper divisors (6116127).

11415321553 is an equidigital number, since it uses as much as digits as its factorization.

11415321553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6116126.

The product of its digits is 9000, while the sum is 31.

Adding to 11415321553 its reverse (35512351411), we get a palindrome (46927672964).

The spelling of 11415321553 in words is "eleven billion, four hundred fifteen million, three hundred twenty-one thousand, five hundred fifty-three".