1313564415661 has 2 divisors, whose sum is σ = 1313564415662. Its totient is φ = 1313564415660.

The previous prime is 1313564415599. The next prime is 1313564415701. The reversal of 1313564415661 is 1665144653131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 720673655625 + 592890760036 = 848925^2 + 769994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313564415661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313564455661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656782207830 + 656782207831.

It is an arithmetic number, because the mean of its divisors is an integer number (656782207831).

Almost surely, 2^{1313564415661} is an apocalyptic number.

It is an amenable number.

1313564415661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313564415661 is an equidigital number, since it uses as much as digits as its factorization.

1313564415661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 46.

It can be divided in two parts, 1313564 and 415661, that added together give a square (1729225 = 1315²).

The spelling of 1313564415661 in words is "one trillion, three hundred thirteen billion, five hundred sixty-four million, four hundred fifteen thousand, six hundred sixty-one".