1055555583581 has 4 divisors (see below), whose sum is σ = 1056235273212. Its totient is φ = 1054875893952.

The previous prime is 1055555583569. The next prime is 1055555583613. The reversal of 1055555583581 is 1853855555501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 203504743225 + 852050840356 = 451115^2 + 923066^2 .

It is a cyclic number.

It is not a de Polignac number, because 1055555583581 - 2⁶ = 1055555583517 is a prime.

It is a super-2 number, since 2×1055555583581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055555582581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339842486 + ... + 339845591.

It is an arithmetic number, because the mean of its divisors is an integer number (264058818303).

Almost surely, 2^{1055555583581} is an apocalyptic number.

It is an amenable number.

1055555583581 is a deficient number, since it is larger than the sum of its proper divisors (679689631).

1055555583581 is an equidigital number, since it uses as much as digits as its factorization.

1055555583581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679689630.

The product of its (nonzero) digits is 15000000, while the sum is 56.

The spelling of 1055555583581 in words is "one trillion, fifty-five billion, five hundred fifty-five million, five hundred eighty-three thousand, five hundred eighty-one".