1280165563 has 2 divisors, whose sum is σ = 1280165564. Its totient is φ = 1280165562.

The previous prime is 1280165521. The next prime is 1280165611. The reversal of 1280165563 is 3655610821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1280165563 - 2¹⁷ = 1280034491 is a prime.

It is a super-2 number, since 2×1280165563² = 3277647737382213938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1280175563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640082781 + 640082782.

It is an arithmetic number, because the mean of its divisors is an integer number (640082782).

Almost surely, 2^1280165563 is an apocalyptic number.

1280165563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280165563 is an equidigital number, since it uses as much as digits as its factorization.

1280165563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 1280165563 is about 35779.4013784468. The cubic root of 1280165563 is about 1085.8138578618.

The spelling of 1280165563 in words is "one billion, two hundred eighty million, one hundred sixty-five thousand, five hundred sixty-three".