1275331663 has 2 divisors, whose sum is σ = 1275331664. Its totient is φ = 1275331662.

The previous prime is 1275331649. The next prime is 1275331751. The reversal of 1275331663 is 3661335721.

It is a weak prime.

It is an emirp because it is prime and its reverse (3661335721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1275331663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1275331613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637665831 + 637665832.

It is an arithmetic number, because the mean of its divisors is an integer number (637665832).

Almost surely, 2^1275331663 is an apocalyptic number.

1275331663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275331663 is an equidigital number, since it uses as much as digits as its factorization.

1275331663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 37.

The square root of 1275331663 is about 35711.7860516665. The cubic root of 1275331663 is about 1084.4454578076.

It can be divided in two parts, 12 and 75331663, that added together give a triangular number (75331675 = T₁₂₂₇₄).

The spelling of 1275331663 in words is "one billion, two hundred seventy-five million, three hundred thirty-one thousand, six hundred sixty-three".