1265552555621 has 2 divisors, whose sum is σ = 1265552555622. Its totient is φ = 1265552555620.

The previous prime is 1265552555591. The next prime is 1265552555651.

It is a happy number.

1265552555621 is nontrivially palindromic in base 10.

It is a balanced prime because it is at equal distance from previous prime (1265552555591) and next prime (1265552555651).

It can be written as a sum of positive squares in only one way, i.e., 1040104221025 + 225448334596 = 1019855^2 + 474814^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1265552555621 - 2⁶ = 1265552555557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1265552555621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265552555651) 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 as a sum of consecutive naturals, namely, 632776277810 + 632776277811.

It is an arithmetic number, because the mean of its divisors is an integer number (632776277811).

Almost surely, 2^{1265552555621} is an apocalyptic number.

It is an amenable number.

1265552555621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265552555621 is an equidigital number, since it uses as much as digits as its factorization.

1265552555621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500000, while the sum is 50.

The spelling of 1265552555621 in words is "one trillion, two hundred sixty-five billion, five hundred fifty-two million, five hundred fifty-five thousand, six hundred twenty-one".