11551543553 has 4 divisors (see below), whose sum is σ = 12601683888. Its totient is φ = 10501403220.

The previous prime is 11551543489. The next prime is 11551543567. The reversal of 11551543553 is 35534515511.

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 not a de Polignac number, because 11551543553 - 2⁶ = 11551543489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11551543573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525070151 + ... + 525070172.

It is an arithmetic number, because the mean of its divisors is an integer number (3150420972).

Almost surely, 2^11551543553 is an apocalyptic number.

It is an amenable number.

11551543553 is a deficient number, since it is larger than the sum of its proper divisors (1050140335).

11551543553 is a wasteful number, since it uses less digits than its factorization.

11551543553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050140334.

The product of its digits is 112500, while the sum is 38.

The spelling of 11551543553 in words is "eleven billion, five hundred fifty-one million, five hundred forty-three thousand, five hundred fifty-three".