1380347566861 has 2 divisors, whose sum is σ = 1380347566862. Its totient is φ = 1380347566860.

The previous prime is 1380347566853. The next prime is 1380347566999. The reversal of 1380347566861 is 1686657430831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1078677496836 + 301670070025 = 1038594^2 + 549245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380347566861 - 2³ = 1380347566853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1380347566796 and 1380347566805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1380347564861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690173783430 + 690173783431.

It is an arithmetic number, because the mean of its divisors is an integer number (690173783431).

Almost surely, 2^{1380347566861} is an apocalyptic number.

It is an amenable number.

1380347566861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380347566861 is an equidigital number, since it uses as much as digits as its factorization.

1380347566861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17418240, while the sum is 58.

The spelling of 1380347566861 in words is "one trillion, three hundred eighty billion, three hundred forty-seven million, five hundred sixty-six thousand, eight hundred sixty-one".