1213663166431 has 6 divisors (see below), whose sum is σ = 1236994536680. Its totient is φ = 1190763858648.

The previous prime is 1213663166407. The next prime is 1213663166447. The reversal of 1213663166431 is 1346613663121.

It is not a de Polignac number, because 1213663166431 - 2¹¹ = 1213663164383 is a prime.

It is a super-2 number, since 2×1213663166431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213663166731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216028371 + ... + 216033988.

Almost surely, 2^{1213663166431} is an apocalyptic number.

1213663166431 is a deficient number, since it is larger than the sum of its proper divisors (23331370249).

1213663166431 is an frugal number, since it uses more digits than its factorization.

1213663166431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432062465 (or 432062412 counting only the distinct ones).

The product of its digits is 279936, while the sum is 43.

The spelling of 1213663166431 in words is "one trillion, two hundred thirteen billion, six hundred sixty-three million, one hundred sixty-six thousand, four hundred thirty-one".