6456439993 has 2 divisors, whose sum is σ = 6456439994. Its totient is φ = 6456439992.

The previous prime is 6456439987. The next prime is 6456440017. The reversal of 6456439993 is 3999346546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4641424384 + 1815015609 = 68128^2 + 42603^2 .

It is a cyclic number.

It is not a de Polignac number, because 6456439993 - 2²¹ = 6454342841 is a prime.

It is not a weakly prime, because it can be changed into another prime (6456439903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3228219996 + 3228219997.

It is an arithmetic number, because the mean of its divisors is an integer number (3228219997).

Almost surely, 2^6456439993 is an apocalyptic number.

It is an amenable number.

6456439993 is a deficient number, since it is larger than the sum of its proper divisors (1).

6456439993 is an equidigital number, since it uses as much as digits as its factorization.

6456439993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18895680, while the sum is 58.

The square root of 6456439993 is about 80351.9756633277. The cubic root of 6456439993 is about 1862.0773023186.

The spelling of 6456439993 in words is "six billion, four hundred fifty-six million, four hundred thirty-nine thousand, nine hundred ninety-three".