16661061712012 has 12 divisors (see below), whose sum is σ = 29206026394776. Its totient is φ = 8316482742080.

The previous prime is 16661061711961. The next prime is 16661061712019. The reversal of 16661061712012 is 21021716016661.

It is not an unprimeable number, because it can be changed into a prime (16661061712019) 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, 3512025814 + ... + 3512030557.

It is an arithmetic number, because the mean of its divisors is an integer number (2433835532898).

Almost surely, 2^{16661061712012} is an apocalyptic number.

It is an amenable number.

16661061712012 is a deficient number, since it is larger than the sum of its proper divisors (12544964682764).

16661061712012 is a wasteful number, since it uses less digits than its factorization.

16661061712012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7024056968 (or 7024056966 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

Adding to 16661061712012 its reverse (21021716016661), we get a palindrome (37682777728673).

The spelling of 16661061712012 in words is "sixteen trillion, six hundred sixty-one billion, sixty-one million, seven hundred twelve thousand, twelve".