16661245322766 has 16 divisors (see below), whose sum is σ = 36351807977088. Its totient is φ = 5048862219000.

The previous prime is 16661245322753. The next prime is 16661245322783. The reversal of 16661245322766 is 66722354216661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126221555410 + ... + 126221555541.

It is an arithmetic number, because the mean of its divisors is an integer number (2271987998568).

Almost surely, 2^{16661245322766} is an apocalyptic number.

16661245322766 is an abundant number, since it is smaller than the sum of its proper divisors (19690562654322).

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

16661245322766 is a wasteful number, since it uses less digits than its factorization.

16661245322766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252443110967.

The product of its digits is 26127360, while the sum is 57.

The spelling of 16661245322766 in words is "sixteen trillion, six hundred sixty-one billion, two hundred forty-five million, three hundred twenty-two thousand, seven hundred sixty-six".