1143215052561 has 20 divisors (see below), whose sum is σ = 1766654171700. Its totient is φ = 735862561056.

The previous prime is 1143215052547. The next prime is 1143215052569. The reversal of 1143215052561 is 1652505123411.

1143215052561 is a `hidden beast` number, since 1 + 1 + 4 + 3 + 21 + 50 + 525 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 896583628161 + 246631424400 = 946881^2 + 496620^2 .

It is not a de Polignac number, because 1143215052561 - 2³⁸ = 868337145617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1143215052569) 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 19 ways as a sum of consecutive naturals, for example, 243338446 + ... + 243343143.

It is an arithmetic number, because the mean of its divisors is an integer number (88332708585).

Almost surely, 2^{1143215052561} is an apocalyptic number.

It is an amenable number.

1143215052561 is a deficient number, since it is larger than the sum of its proper divisors (623439119139).

1143215052561 is an equidigital number, since it uses as much as digits as its factorization.

1143215052561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486681630 (or 486681621 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 1143215052561 in words is "one trillion, one hundred forty-three billion, two hundred fifteen million, fifty-two thousand, five hundred sixty-one".