646433927593 has 2 divisors, whose sum is σ = 646433927594. Its totient is φ = 646433927592.

The previous prime is 646433927549. The next prime is 646433927641. The reversal of 646433927593 is 395729334646.

646433927593 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 can be written as a sum of positive squares in only one way, i.e., 642878429209 + 3555498384 = 801797^2 + 59628^2 .

It is a cyclic number.

It is not a de Polignac number, because 646433927593 - 2¹⁷ = 646433796521 is a prime.

It is not a weakly prime, because it can be changed into another prime (646433927543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323216963796 + 323216963797.

It is an arithmetic number, because the mean of its divisors is an integer number (323216963797).

Almost surely, 2^646433927593 is an apocalyptic number.

It is an amenable number.

646433927593 is a deficient number, since it is larger than the sum of its proper divisors (1).

646433927593 is an equidigital number, since it uses as much as digits as its factorization.

646433927593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88179840, while the sum is 61.

The spelling of 646433927593 in words is "six hundred forty-six billion, four hundred thirty-three million, nine hundred twenty-seven thousand, five hundred ninety-three".