1316620313665 has 8 divisors (see below), whose sum is σ = 1672882281000. Its totient is φ = 991337647872.

The previous prime is 1316620313647. The next prime is 1316620313681. The reversal of 1316620313665 is 5663130266131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 218089934001 + 1098530379664 = 467001^2 + 1048108^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1316620313665 - 2⁵ = 1316620313633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7744825290 + ... + 7744825459.

It is an arithmetic number, because the mean of its divisors is an integer number (209110285125).

Almost surely, 2^{1316620313665} is an apocalyptic number.

It is an amenable number.

1316620313665 is a deficient number, since it is larger than the sum of its proper divisors (356261967335).

1316620313665 is a wasteful number, since it uses less digits than its factorization.

1316620313665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15489650771.

The product of its (nonzero) digits is 349920, while the sum is 43.

Adding to 1316620313665 its reverse (5663130266131), we get a palindrome (6979750579796).

The spelling of 1316620313665 in words is "one trillion, three hundred sixteen billion, six hundred twenty million, three hundred thirteen thousand, six hundred sixty-five".