1666105666104 has 128 divisors (see below), whose sum is σ = 4590104578560. Its totient is φ = 499752000000.

The previous prime is 1666105666103. The next prime is 1666105666123. The reversal of 1666105666104 is 4016665016661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666105666103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168271554 + ... + 168281454.

It is an arithmetic number, because the mean of its divisors is an integer number (35860192020).

Almost surely, 2^{1666105666104} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666105666104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2295052289280).

1666105666104 is an abundant number, since it is smaller than the sum of its proper divisors (2923998912456).

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

1666105666104 is a wasteful number, since it uses less digits than its factorization.

1666105666104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16333 (or 16329 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 1666105666104 in words is "one trillion, six hundred sixty-six billion, one hundred five million, six hundred sixty-six thousand, one hundred four".