765565663 has 2 divisors, whose sum is σ = 765565664. Its totient is φ = 765565662.

The previous prime is 765565609. The next prime is 765565667. The reversal of 765565663 is 366565567.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-765565663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (765565667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382782831 + 382782832.

It is an arithmetic number, because the mean of its divisors is an integer number (382782832).

Almost surely, 2^765565663 is an apocalyptic number.

765565663 is a deficient number, since it is larger than the sum of its proper divisors (1).

765565663 is an equidigital number, since it uses as much as digits as its factorization.

765565663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402000, while the sum is 49.

The square root of 765565663 is about 27668.8572767290. The cubic root of 765565663 is about 914.8027934559.

The spelling of 765565663 in words is "seven hundred sixty-five million, five hundred sixty-five thousand, six hundred sixty-three".