1666320288 has 24 divisors (see below), whose sum is σ = 4374091008. Its totient is φ = 555440064.

The previous prime is 1666320287. The next prime is 1666320289. The reversal of 1666320288 is 8820236661.

It is an interprime number because it is at equal distance from previous prime (1666320287) and next prime (1666320289).

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (1666320287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8678656 + ... + 8678847.

It is an arithmetic number, because the mean of its divisors is an integer number (182253792).

Almost surely, 2^1666320288 is an apocalyptic number.

It is an amenable number.

1666320288 is an abundant number, since it is smaller than the sum of its proper divisors (2707770720).

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

1666320288 is a wasteful number, since it uses less digits than its factorization.

1666320288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17357516 (or 17357508 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 1666320288 is about 40820.5865709938. The cubic root of 1666320288 is about 1185.5489603420.

The spelling of 1666320288 in words is "one billion, six hundred sixty-six million, three hundred twenty thousand, two hundred eighty-eight".