763643561 has 2 divisors, whose sum is σ = 763643562. Its totient is φ = 763643560.

The previous prime is 763643513. The next prime is 763643581. The reversal of 763643561 is 165346367.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 416976400 + 346667161 = 20420^2 + 18619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-763643561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (763643501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 381821780 + 381821781.

It is an arithmetic number, because the mean of its divisors is an integer number (381821781).

Almost surely, 2^763643561 is an apocalyptic number.

It is an amenable number.

763643561 is a deficient number, since it is larger than the sum of its proper divisors (1).

763643561 is an equidigital number, since it uses as much as digits as its factorization.

763643561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 41.

The square root of 763643561 is about 27634.1014147376. The cubic root of 763643561 is about 914.0365548538.

The spelling of 763643561 in words is "seven hundred sixty-three million, six hundred forty-three thousand, five hundred sixty-one".