126431505185 has 4 divisors (see below), whose sum is σ = 151717806228. Its totient is φ = 101145204144.

The previous prime is 126431505173. The next prime is 126431505199. The reversal of 126431505185 is 581505134621.

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 89551759504 + 36879745681 = 299252^2 + 192041^2 .

It is a cyclic number.

It is not a de Polignac number, because 126431505185 - 2¹⁴ = 126431488801 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 12643150514 + ... + 12643150523.

It is an arithmetic number, because the mean of its divisors is an integer number (37929451557).

Almost surely, 2^126431505185 is an apocalyptic number.

It is an amenable number.

126431505185 is a deficient number, since it is larger than the sum of its proper divisors (25286301043).

126431505185 is an equidigital number, since it uses as much as digits as its factorization.

126431505185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25286301042.

The product of its (nonzero) digits is 144000, while the sum is 41.

The spelling of 126431505185 in words is "one hundred twenty-six billion, four hundred thirty-one million, five hundred five thousand, one hundred eighty-five".