1321544345166 has 20 divisors (see below), whose sum is σ = 2961238255272. Its totient is φ = 440514781668.

The previous prime is 1321544345153. The next prime is 1321544345197. The reversal of 1321544345166 is 6615434451231.

1321544345166 is a `hidden beast` number, since 1 + 3 + 2 + 1 + 5 + 443 + 45 + 166 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4078840410 + ... + 4078840733.

Almost surely, 2^{1321544345166} is an apocalyptic number.

1321544345166 is an abundant number, since it is smaller than the sum of its proper divisors (1639693910106).

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

1321544345166 is an equidigital number, since it uses as much as digits as its factorization.

1321544345166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8157681157 (or 8157681148 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

Adding to 1321544345166 its reverse (6615434451231), we get a palindrome (7936978796397).

The spelling of 1321544345166 in words is "one trillion, three hundred twenty-one billion, five hundred forty-four million, three hundred forty-five thousand, one hundred sixty-six".