1263488843621 has 2 divisors, whose sum is σ = 1263488843622. Its totient is φ = 1263488843620.

The previous prime is 1263488843611. The next prime is 1263488843647.

1263488843621 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1157154155521 + 106334688100 = 1075711^2 + 326090^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1263488843621 - 2¹⁰ = 1263488842597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263488843611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631744421810 + 631744421811.

It is an arithmetic number, because the mean of its divisors is an integer number (631744421811).

Almost surely, 2^{1263488843621} is an apocalyptic number.

It is an amenable number.

1263488843621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263488843621 is an equidigital number, since it uses as much as digits as its factorization.

1263488843621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10616832, while the sum is 56.

The spelling of 1263488843621 in words is "one trillion, two hundred sixty-three billion, four hundred eighty-eight million, eight hundred forty-three thousand, six hundred twenty-one".