1861405459853 has 2 divisors, whose sum is σ = 1861405459854. Its totient is φ = 1861405459852.

The previous prime is 1861405459819. The next prime is 1861405459871. The reversal of 1861405459853 is 3589545041681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1856561578249 + 4843881604 = 1362557^2 + 69598^2 .

It is a cyclic number.

It is not a de Polignac number, because 1861405459853 - 2⁶ = 1861405459789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1861405459792 and 1861405459801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861405459813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930702729926 + 930702729927.

It is an arithmetic number, because the mean of its divisors is an integer number (930702729927).

Almost surely, 2^{1861405459853} is an apocalyptic number.

It is an amenable number.

1861405459853 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861405459853 is an equidigital number, since it uses as much as digits as its factorization.

1861405459853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736000, while the sum is 59.

The spelling of 1861405459853 in words is "one trillion, eight hundred sixty-one billion, four hundred five million, four hundred fifty-nine thousand, eight hundred fifty-three".