1316360666221 has 4 divisors (see below), whose sum is σ = 1316364552412. Its totient is φ = 1316356780032.

The previous prime is 1316360666209. The next prime is 1316360666227. The reversal of 1316360666221 is 1226660636131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 237641625225 + 1078719040996 = 487485^2 + 1038614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1316360666221 - 2⁹ = 1316360665709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316360666227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1380756 + ... + 2130541.

It is an arithmetic number, because the mean of its divisors is an integer number (329091138103).

Almost surely, 2^{1316360666221} is an apocalyptic number.

It is an amenable number.

1316360666221 is a deficient number, since it is larger than the sum of its proper divisors (3886191).

1316360666221 is an equidigital number, since it uses as much as digits as its factorization.

1316360666221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886190.

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

The spelling of 1316360666221 in words is "one trillion, three hundred sixteen billion, three hundred sixty million, six hundred sixty-six thousand, two hundred twenty-one".