11533535551 has 4 divisors (see below), whose sum is σ = 11801757352. Its totient is φ = 11265313752.

The previous prime is 11533535537. The next prime is 11533535561. The reversal of 11533535551 is 15553533511.

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 11533535551 - 2¹⁷ = 11533404479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11533535551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11533535561) 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, 134110836 + ... + 134110921.

It is an arithmetic number, because the mean of its divisors is an integer number (2950439338).

Almost surely, 2^11533535551 is an apocalyptic number.

11533535551 is a deficient number, since it is larger than the sum of its proper divisors (268221801).

11533535551 is an equidigital number, since it uses as much as digits as its factorization.

11533535551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268221800.

The product of its digits is 84375, while the sum is 37.

The spelling of 11533535551 in words is "eleven billion, five hundred thirty-three million, five hundred thirty-five thousand, five hundred fifty-one".