1263322326551 has 2 divisors, whose sum is σ = 1263322326552. Its totient is φ = 1263322326550.

The previous prime is 1263322326521. The next prime is 1263322326583. The reversal of 1263322326551 is 1556232233621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1263322326551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1263322326499 and 1263322326508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263322326521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631661163275 + 631661163276.

It is an arithmetic number, because the mean of its divisors is an integer number (631661163276).

Almost surely, 2^{1263322326551} is an apocalyptic number.

1263322326551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263322326551 is an equidigital number, since it uses as much as digits as its factorization.

1263322326551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 41.

The spelling of 1263322326551 in words is "one trillion, two hundred sixty-three billion, three hundred twenty-two million, three hundred twenty-six thousand, five hundred fifty-one".