1666465056 has 96 divisors (see below), whose sum is σ = 4890755520. Its totient is φ = 552033792.

The previous prime is 1666465051. The next prime is 1666465057. The reversal of 1666465056 is 6505646661.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1666465051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134916 + ... + 146748.

It is an arithmetic number, because the mean of its divisors is an integer number (50945370).

Almost surely, 2^1666465056 is an apocalyptic number.

1666465056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666465056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2445377760).

1666465056 is an abundant number, since it is smaller than the sum of its proper divisors (3224290464).

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

1666465056 is a wasteful number, since it uses less digits than its factorization.

1666465056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12015 (or 12001 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The square root of 1666465056 is about 40822.3597554086. The cubic root of 1666465056 is about 1185.5832923935.

The spelling of 1666465056 in words is "one billion, six hundred sixty-six million, four hundred sixty-five thousand, fifty-six".