1055533851661 has 4 divisors (see below), whose sum is σ = 1055827630332. Its totient is φ = 1055240072992.

The previous prime is 1055533851641. The next prime is 1055533851677. The reversal of 1055533851661 is 1661583355501.

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 709444021225 + 346089830436 = 842285^2 + 588294^2 .

It is a cyclic number.

It is not a de Polignac number, because 1055533851661 - 2²⁷ = 1055399633933 is a prime.

It is a super-2 number, since 2×1055533851661² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055533851641) 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 in 3 ways as a sum of consecutive naturals, for example, 146883946 + ... + 146891131.

It is an arithmetic number, because the mean of its divisors is an integer number (263956907583).

Almost surely, 2^{1055533851661} is an apocalyptic number.

It is an amenable number.

1055533851661 is a deficient number, since it is larger than the sum of its proper divisors (293778671).

1055533851661 is an equidigital number, since it uses as much as digits as its factorization.

1055533851661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293778670.

The product of its (nonzero) digits is 1620000, while the sum is 49.

The spelling of 1055533851661 in words is "one trillion, fifty-five billion, five hundred thirty-three million, eight hundred fifty-one thousand, six hundred sixty-one".