1055040866861 has 2 divisors, whose sum is σ = 1055040866862. Its totient is φ = 1055040866860.

The previous prime is 1055040866843. The next prime is 1055040866899. The reversal of 1055040866861 is 1686680405501.

1055040866861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529678284100 + 525362582761 = 727790^2 + 724819^2 .

It is a cyclic number.

It is not a de Polignac number, because 1055040866861 - 2¹⁴ = 1055040850477 is a prime.

It is a super-2 number, since 2×1055040866861² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1055040866801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527520433430 + 527520433431.

It is an arithmetic number, because the mean of its divisors is an integer number (527520433431).

Almost surely, 2^{1055040866861} is an apocalyptic number.

It is an amenable number.

1055040866861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1055040866861 is an equidigital number, since it uses as much as digits as its factorization.

1055040866861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 1055040866861 in words is "one trillion, fifty-five billion, forty million, eight hundred sixty-six thousand, eight hundred sixty-one".