646699793 has 2 divisors, whose sum is σ = 646699794. Its totient is φ = 646699792.

The previous prime is 646699759. The next prime is 646699811. The reversal of 646699793 is 397996646.

646699793 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 446392384 + 200307409 = 21128^2 + 14153^2 .

It is a cyclic number.

It is not a de Polignac number, because 646699793 - 2¹⁰ = 646698769 is a prime.

It is not a weakly prime, because it can be changed into another prime (646699723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323349896 + 323349897.

It is an arithmetic number, because the mean of its divisors is an integer number (323349897).

Almost surely, 2^646699793 is an apocalyptic number.

It is an amenable number.

646699793 is a deficient number, since it is larger than the sum of its proper divisors (1).

646699793 is an equidigital number, since it uses as much as digits as its factorization.

646699793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 59.

The square root of 646699793 is about 25430.2928217510. The cubic root of 646699793 is about 864.7705821246.

The spelling of 646699793 in words is "six hundred forty-six million, six hundred ninety-nine thousand, seven hundred ninety-three".