1666440315 has 24 divisors (see below), whose sum is σ = 3040524240. Its totient is φ = 841990464.

The previous prime is 1666440301. The next prime is 1666440323. The reversal of 1666440315 is 5130446661.

It is a happy number.

It is not a de Polignac number, because 1666440315 - 2⁷ = 1666440187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1666440315.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 973672 + ... + 975381.

It is an arithmetic number, because the mean of its divisors is an integer number (126688510).

Almost surely, 2^1666440315 is an apocalyptic number.

1666440315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666440315 is a deficient number, since it is larger than the sum of its proper divisors (1374083925).

1666440315 is a wasteful number, since it uses less digits than its factorization.

1666440315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949083 (or 1949080 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1666440315 is about 40822.0567218263. The cubic root of 1666440315 is about 1185.5774251515.

Adding to 1666440315 its reverse (5130446661), we get a palindrome (6796886976).

The spelling of 1666440315 in words is "one billion, six hundred sixty-six million, four hundred forty thousand, three hundred fifteen".