11666561516012 has 24 divisors (see below), whose sum is σ = 22942937030496. Its totient is φ = 5150455250688.

The previous prime is 11666561515997. The next prime is 11666561516023. The reversal of 11666561516012 is 21061516566611.

It is a happy number.

It is a super-2 number, since 2×11666561516012² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4877323853 + ... + 4877326244.

It is an arithmetic number, because the mean of its divisors is an integer number (955955709604).

Almost surely, 2^{11666561516012} is an apocalyptic number.

It is an amenable number.

11666561516012 is a deficient number, since it is larger than the sum of its proper divisors (11276375514484).

11666561516012 is a wasteful number, since it uses less digits than its factorization.

11666561516012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9754650137 (or 9754650135 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The spelling of 11666561516012 in words is "eleven trillion, six hundred sixty-six billion, five hundred sixty-one million, five hundred sixteen thousand, twelve".