143643221255581 has 2 divisors, whose sum is σ = 143643221255582. Its totient is φ = 143643221255580.

The previous prime is 143643221255467. The next prime is 143643221255629. The reversal of 143643221255581 is 185552122346341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134281512240100 + 9361709015481 = 11587990^2 + 3059691^2 .

It is a cyclic number.

It is not a de Polignac number, because 143643221255581 - 2¹⁹ = 143643220731293 is a prime.

It is a super-3 number, since 3×143643221255581³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143643221255981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71821610627790 + 71821610627791.

It is an arithmetic number, because the mean of its divisors is an integer number (71821610627791).

Almost surely, 2^{143643221255581} is an apocalyptic number.

It is an amenable number.

143643221255581 is a deficient number, since it is larger than the sum of its proper divisors (1).

143643221255581 is an equidigital number, since it uses as much as digits as its factorization.

143643221255581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912000, while the sum is 52.

The spelling of 143643221255581 in words is "one hundred forty-three trillion, six hundred forty-three billion, two hundred twenty-one million, two hundred fifty-five thousand, five hundred eighty-one".