1321130160666 has 24 divisors (see below), whose sum is σ = 2867409620244. Its totient is φ = 439613498880.

The previous prime is 1321130160661. The next prime is 1321130160677. The reversal of 1321130160666 is 6660610311231.

It can be written as a sum of positive squares in 2 ways, for example, as 997791221025 + 323338939641 = 998895^2 + 568629^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321130160666.

It is not an unprimeable number, because it can be changed into a prime (1321130160661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63591105 + ... + 63611876.

Almost surely, 2^{1321130160666} is an apocalyptic number.

1321130160666 is an abundant number, since it is smaller than the sum of its proper divisors (1546279459578).

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

1321130160666 is a wasteful number, since it uses less digits than its factorization.

1321130160666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127203566 (or 127203563 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

Adding to 1321130160666 its reverse (6660610311231), we get a palindrome (7981740471897).

The spelling of 1321130160666 in words is "one trillion, three hundred twenty-one billion, one hundred thirty million, one hundred sixty thousand, six hundred sixty-six".