11561516066 has 8 divisors (see below), whose sum is σ = 17344289280. Its totient is φ = 5780086308.

The previous prime is 11561516027. The next prime is 11561516117. The reversal of 11561516066 is 66061516511.

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

It is a super-2 number, since 2×11561516066² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314066 + ... + 348941.

It is an arithmetic number, because the mean of its divisors is an integer number (2168036160).

Almost surely, 2^11561516066 is an apocalyptic number.

11561516066 is a deficient number, since it is larger than the sum of its proper divisors (5782773214).

11561516066 is an equidigital number, since it uses as much as digits as its factorization.

11561516066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671728.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 11561516066 in words is "eleven billion, five hundred sixty-one million, five hundred sixteen thousand, sixty-six".