126553303355621 has 4 divisors (see below), whose sum is σ = 127806306359244. Its totient is φ = 125300300352000.

The previous prime is 126553303355561. The next prime is 126553303355651.

126553303355621 is nontrivially palindromic in base 10.

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 80156907335521 + 46396396020100 = 8953039^2 + 6811490^2 .

It is a cyclic number.

It is not a de Polignac number, because 126553303355621 - 2¹⁴ = 126553303339237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126553303355621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126553303355651) 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, 626501501660 + ... + 626501501861.

It is an arithmetic number, because the mean of its divisors is an integer number (31951576589811).

Almost surely, 2^{126553303355621} is an apocalyptic number.

It is an amenable number.

126553303355621 is a deficient number, since it is larger than the sum of its proper divisors (1253003003623).

126553303355621 is a wasteful number, since it uses less digits than its factorization.

126553303355621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253003003622.

The product of its (nonzero) digits is 7290000, while the sum is 50.

The spelling of 126553303355621 in words is "one hundred twenty-six trillion, five hundred fifty-three billion, three hundred three million, three hundred fifty-five thousand, six hundred twenty-one".