1666365026928 has 160 divisors (see below), whose sum is σ = 4973239025664. Its totient is φ = 470949728256.

The previous prime is 1666365026891. The next prime is 1666365026983. The reversal of 1666365026928 is 8296205636661.

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 31 ways as a sum of consecutive naturals, for example, 14322526 + ... + 14438402.

Almost surely, 2^{1666365026928} 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 1666365026928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2486619512832).

1666365026928 is an abundant number, since it is smaller than the sum of its proper divisors (3306873998736).

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

1666365026928 is a wasteful number, since it uses less digits than its factorization.

1666365026928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116359 (or 116353 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 60.

The spelling of 1666365026928 in words is "one trillion, six hundred sixty-six billion, three hundred sixty-five million, twenty-six thousand, nine hundred twenty-eight".