126509587138 has 24 divisors (see below), whose sum is σ = 212003423100. Its totient is φ = 56561656800.

The previous prime is 126509587129. The next prime is 126509587187. The reversal of 126509587138 is 831785905621.

It can be written as a sum of positive squares in 2 ways, for example, as 126496169569 + 13417569 = 355663^2 + 3663^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 4270213 + ... + 4299736.

Almost surely, 2^126509587138 is an apocalyptic number.

126509587138 is a deficient number, since it is larger than the sum of its proper divisors (85493835962).

126509587138 is a wasteful number, since it uses less digits than its factorization.

126509587138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8570034 (or 8570023 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 55.

The spelling of 126509587138 in words is "one hundred twenty-six billion, five hundred nine million, five hundred eighty-seven thousand, one hundred thirty-eight".