1666298508 has 72 divisors (see below), whose sum is σ = 4529448000. Its totient is φ = 475386912.

The previous prime is 1666298479. The next prime is 1666298521. The reversal of 1666298508 is 8058926661.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 503443 + ... + 506741.

It is an arithmetic number, because the mean of its divisors is an integer number (62909000).

Almost surely, 2^1666298508 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 1666298508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2264724000).

1666298508 is an abundant number, since it is smaller than the sum of its proper divisors (2863149492).

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

1666298508 is a wasteful number, since it uses less digits than its factorization.

1666298508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4179 (or 4170 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The square root of 1666298508 is about 40820.3197929659. The cubic root of 1666298508 is about 1185.5437949947.

The spelling of 1666298508 in words is "one billion, six hundred sixty-six million, two hundred ninety-eight thousand, five hundred eight".