1666745076 has 60 divisors (see below), whose sum is σ = 4134620672. Its totient is φ = 522585984.

The previous prime is 1666745063. The next prime is 1666745089. The reversal of 1666745076 is 6705476661.

It is an interprime number because it is at equal distance from previous prime (1666745063) and next prime (1666745089).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1001421 + ... + 1003083.

Almost surely, 2^1666745076 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 1666745076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2067310336).

1666745076 is an abundant number, since it is smaller than the sum of its proper divisors (2467875596).

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

1666745076 is an equidigital number, since it uses as much as digits as its factorization.

1666745076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1738 (or 1685 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 48.

The square root of 1666745076 is about 40825.7893493806. The cubic root of 1666745076 is about 1185.6496941140.

The spelling of 1666745076 in words is "one billion, six hundred sixty-six million, seven hundred forty-five thousand, seventy-six".