1055554720861 has 2 divisors, whose sum is σ = 1055554720862. Its totient is φ = 1055554720860.

The previous prime is 1055554720793. The next prime is 1055554720921. The reversal of 1055554720861 is 1680274555501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 566211100900 + 489343619961 = 752470^2 + 699531^2 .

It is an emirp because it is prime and its reverse (1680274555501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1055554720861 - 2⁷ = 1055554720733 is a prime.

It is a super-2 number, since 2×1055554720861² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1055554720061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527777360430 + 527777360431.

It is an arithmetic number, because the mean of its divisors is an integer number (527777360431).

Almost surely, 2^{1055554720861} is an apocalyptic number.

It is an amenable number.

1055554720861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1055554720861 is an equidigital number, since it uses as much as digits as its factorization.

1055554720861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680000, while the sum is 49.

The spelling of 1055554720861 in words is "one trillion, fifty-five billion, five hundred fifty-four million, seven hundred twenty thousand, eight hundred sixty-one".