646995763 has 2 divisors, whose sum is σ = 646995764. Its totient is φ = 646995762.

The previous prime is 646995743. The next prime is 646995787. The reversal of 646995763 is 367599646.

646995763 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646995763 - 2⁵ = 646995731 is a prime.

It is not a weakly prime, because it can be changed into another prime (646995743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323497881 + 323497882.

It is an arithmetic number, because the mean of its divisors is an integer number (323497882).

Almost surely, 2^646995763 is an apocalyptic number.

646995763 is a deficient number, since it is larger than the sum of its proper divisors (1).

646995763 is an equidigital number, since it uses as much as digits as its factorization.

646995763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7348320, while the sum is 55.

The square root of 646995763 is about 25436.1113969883. Note that the first 3 decimals coincide. The cubic root of 646995763 is about 864.9024862509.

The spelling of 646995763 in words is "six hundred forty-six million, nine hundred ninety-five thousand, seven hundred sixty-three".