126555403213 has 4 divisors (see below), whose sum is σ = 126556125340. Its totient is φ = 126554681088.

The previous prime is 126555403199. The next prime is 126555403283. The reversal of 126555403213 is 312304555621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 74650261284 + 51905141929 = 273222^2 + 227827^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126555403213 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 (126555403283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87931 + ... + 510727.

It is an arithmetic number, because the mean of its divisors is an integer number (31639031335).

Almost surely, 2^126555403213 is an apocalyptic number.

It is an amenable number.

126555403213 is a deficient number, since it is larger than the sum of its proper divisors (722127).

126555403213 is an equidigital number, since it uses as much as digits as its factorization.

126555403213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722126.

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 126555403213 its reverse (312304555621), we get a palindrome (438859958834).

The spelling of 126555403213 in words is "one hundred twenty-six billion, five hundred fifty-five million, four hundred three thousand, two hundred thirteen".