1002431666 has 16 divisors (see below), whose sum is σ = 1543448088. Its totient is φ = 488112000.

The previous prime is 1002431663. The next prime is 1002431669. The reversal of 1002431666 is 6661342001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1002431663) and next prime (1002431669).

It can be written as a sum of positive squares in 4 ways, for example, as 941201041 + 61230625 = 30679^2 + 7825^2 .

It is not an unprimeable number, because it can be changed into a prime (1002431663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28355 + ... + 52998.

Almost surely, 2^1002431666 is an apocalyptic number.

1002431666 is a deficient number, since it is larger than the sum of its proper divisors (541016422).

1002431666 is a wasteful number, since it uses less digits than its factorization.

1002431666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81517.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1002431666 is about 31661.2012722196. The cubic root of 1002431666 is about 1000.8098992195.

Adding to 1002431666 its reverse (6661342001), we get a palindrome (7663773667).

The spelling of 1002431666 in words is "one billion, two million, four hundred thirty-one thousand, six hundred sixty-six".