11506556566 has 8 divisors (see below), whose sum is σ = 17263109160. Its totient is φ = 5752186848.

The previous prime is 11506556549. The next prime is 11506556569. The reversal of 11506556566 is 66565560511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11506556569) 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, 532476 + ... + 553663.

It is an arithmetic number, because the mean of its divisors is an integer number (2157888645).

Almost surely, 2^11506556566 is an apocalyptic number.

11506556566 is a deficient number, since it is larger than the sum of its proper divisors (5756552594).

11506556566 is a wasteful number, since it uses less digits than its factorization.

11506556566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091438.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 11506556566 in words is "eleven billion, five hundred six million, five hundred fifty-six thousand, five hundred sixty-six".