815740663 has 2 divisors, whose sum is σ = 815740664. Its totient is φ = 815740662.

The previous prime is 815740657. The next prime is 815740711. The reversal of 815740663 is 366047518.

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-815740663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815740063) 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, 407870331 + 407870332.

It is an arithmetic number, because the mean of its divisors is an integer number (407870332).

Almost surely, 2^815740663 is an apocalyptic number.

815740663 is a deficient number, since it is larger than the sum of its proper divisors (1).

815740663 is an equidigital number, since it uses as much as digits as its factorization.

815740663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 815740663 is about 28561.1740479974. The cubic root of 815740663 is about 934.3667394534.

The spelling of 815740663 in words is "eight hundred fifteen million, seven hundred forty thousand, six hundred sixty-three".