11551534557 has 64 divisors (see below), whose sum is σ = 17183539200. Its totient is φ = 6873128640.

The previous prime is 11551534541. The next prime is 11551534567. The reversal of 11551534557 is 75543515511.

It is not a de Polignac number, because 11551534557 - 2⁴ = 11551534541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551534517) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30478794 + ... + 30479172.

It is an arithmetic number, because the mean of its divisors is an integer number (268492800).

Almost surely, 2^11551534557 is an apocalyptic number.

It is an amenable number.

11551534557 is a deficient number, since it is larger than the sum of its proper divisors (5632004643).

11551534557 is a wasteful number, since it uses less digits than its factorization.

11551534557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846.

The product of its digits is 262500, while the sum is 42.

The spelling of 11551534557 in words is "eleven billion, five hundred fifty-one million, five hundred thirty-four thousand, five hundred fifty-seven".