1251388887563 has 2 divisors, whose sum is σ = 1251388887564. Its totient is φ = 1251388887562.

The previous prime is 1251388887481. The next prime is 1251388887571. The reversal of 1251388887563 is 3657888831521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251388887563 - 2¹⁴ = 1251388871179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1251388887563.

It is not a weakly prime, because it can be changed into another prime (1251388887583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625694443781 + 625694443782.

It is an arithmetic number, because the mean of its divisors is an integer number (625694443782).

Almost surely, 2^{1251388887563} is an apocalyptic number.

1251388887563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251388887563 is an equidigital number, since it uses as much as digits as its factorization.

1251388887563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77414400, while the sum is 65.

The spelling of 1251388887563 in words is "one trillion, two hundred fifty-one billion, three hundred eighty-eight million, eight hundred eighty-seven thousand, five hundred sixty-three".