1571112056561 has 4 divisors (see below), whose sum is σ = 1579252533732. Its totient is φ = 1562971579392.

The previous prime is 1571112056531. The next prime is 1571112056581. The reversal of 1571112056561 is 1656502111751.

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 1041665184400 + 529446872161 = 1020620^2 + 727631^2 .

It is a cyclic number.

It is not a de Polignac number, because 1571112056561 - 2¹⁴ = 1571112040177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1571112056531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4070238296 + ... + 4070238681.

It is an arithmetic number, because the mean of its divisors is an integer number (394813133433).

Almost surely, 2^{1571112056561} is an apocalyptic number.

It is an amenable number.

1571112056561 is a deficient number, since it is larger than the sum of its proper divisors (8140477171).

1571112056561 is an equidigital number, since it uses as much as digits as its factorization.

1571112056561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8140477170.

The product of its (nonzero) digits is 63000, while the sum is 41.

The spelling of 1571112056561 in words is "one trillion, five hundred seventy-one billion, one hundred twelve million, fifty-six thousand, five hundred sixty-one".