126205473634543 has 4 divisors (see below), whose sum is σ = 126290232181120. Its totient is φ = 126120715087968.

The previous prime is 126205473634531. The next prime is 126205473634547. The reversal of 126205473634543 is 345436374502621.

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

It is a cyclic number.

It is not a de Polignac number, because 126205473634543 - 2⁴¹ = 124006450378991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126205473634547) 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, 42379271055 + ... + 42379274032.

It is an arithmetic number, because the mean of its divisors is an integer number (31572558045280).

Almost surely, 2^{126205473634543} is an apocalyptic number.

126205473634543 is a deficient number, since it is larger than the sum of its proper divisors (84758546577).

126205473634543 is an equidigital number, since it uses as much as digits as its factorization.

126205473634543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84758546576.

The product of its (nonzero) digits is 43545600, while the sum is 55.

The spelling of 126205473634543 in words is "one hundred twenty-six trillion, two hundred five billion, four hundred seventy-three million, six hundred thirty-four thousand, five hundred forty-three".