1668431236 has 6 divisors (see below), whose sum is σ = 2919754670. Its totient is φ = 834215616.

The previous prime is 1668431231. The next prime is 1668431243. The reversal of 1668431236 is 6321348661.

It can be written as a sum of positive squares in only one way, i.e., 1096934400 + 571496836 = 33120^2 + 23906^2 .

It is not an unprimeable number, because it can be changed into a prime (1668431231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208553901 + ... + 208553908.

Almost surely, 2^1668431236 is an apocalyptic number.

It is an amenable number.

1668431236 is a deficient number, since it is larger than the sum of its proper divisors (1251323434).

1668431236 is a wasteful number, since it uses less digits than its factorization.

1668431236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417107813 (or 417107811 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 1668431236 is about 40846.4348015834. The cubic root of 1668431236 is about 1186.0493795717.

Adding to 1668431236 its reverse (6321348661), we get a palindrome (7989779897).

The spelling of 1668431236 in words is "one billion, six hundred sixty-eight million, four hundred thirty-one thousand, two hundred thirty-six".