11506515516 has 18 divisors (see below), whose sum is σ = 29085914312. Its totient is φ = 3835505160.

The previous prime is 11506515497. The next prime is 11506515521. The reversal of 11506515516 is 61551560511.

It is a happy number.

11506515516 is a `hidden beast` number, since 1 + 1 + 50 + 6 + 51 + 551 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 319625431 = 11506515516 / (1 + 1 + 5 + 0 + 6 + 5 + 1 + 5 + 5 + 1 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 159812680 + ... + 159812751.

Almost surely, 2^11506515516 is an apocalyptic number.

It is an amenable number.

11506515516 is an abundant number, since it is smaller than the sum of its proper divisors (17579398796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11506515516 is a wasteful number, since it uses less digits than its factorization.

11506515516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319625441 (or 319625436 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 11506515516 in words is "eleven billion, five hundred six million, five hundred fifteen thousand, five hundred sixteen".