728663366819 has 2 divisors, whose sum is σ = 728663366820. Its totient is φ = 728663366818.

The previous prime is 728663366803. The next prime is 728663366887. The reversal of 728663366819 is 918663366827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728663366819 - 2⁴ = 728663366803 is a prime.

It is a super-2 number, since 2×728663366819² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (728663326819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364331683409 + 364331683410.

It is an arithmetic number, because the mean of its divisors is an integer number (364331683410).

Almost surely, 2^728663366819 is an apocalyptic number.

728663366819 is a deficient number, since it is larger than the sum of its proper divisors (1).

728663366819 is an equidigital number, since it uses as much as digits as its factorization.

728663366819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94058496, while the sum is 65.

The spelling of 728663366819 in words is "seven hundred twenty-eight billion, six hundred sixty-three million, three hundred sixty-six thousand, eight hundred nineteen".