1316331620605 has 4 divisors (see below), whose sum is σ = 1579597944732. Its totient is φ = 1053065296480.

The previous prime is 1316331620557. The next prime is 1316331620627. The reversal of 1316331620605 is 5060261336131.

It is a happy number.

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 315903574809 + 1000428045796 = 562053^2 + 1000214^2 .

It is not a de Polignac number, because 1316331620605 - 2⁷ = 1316331620477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131633162056 + ... + 131633162065.

It is an arithmetic number, because the mean of its divisors is an integer number (394899486183).

Almost surely, 2^{1316331620605} is an apocalyptic number.

It is an amenable number.

1316331620605 is a deficient number, since it is larger than the sum of its proper divisors (263266324127).

1316331620605 is an equidigital number, since it uses as much as digits as its factorization.

1316331620605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263266324126.

The product of its (nonzero) digits is 58320, while the sum is 37.

Adding to 1316331620605 its reverse (5060261336131), we get a palindrome (6376592956736).

The spelling of 1316331620605 in words is "one trillion, three hundred sixteen billion, three hundred thirty-one million, six hundred twenty thousand, six hundred five".