6446243693 has 2 divisors, whose sum is σ = 6446243694. Its totient is φ = 6446243692.

The previous prime is 6446243681. The next prime is 6446243707. The reversal of 6446243693 is 3963426446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6436371529 + 9872164 = 80227^2 + 3142^2 .

It is a cyclic number.

It is not a de Polignac number, because 6446243693 - 2¹⁶ = 6446178157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6446243093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3223121846 + 3223121847.

It is an arithmetic number, because the mean of its divisors is an integer number (3223121847).

Almost surely, 2^6446243693 is an apocalyptic number.

It is an amenable number.

6446243693 is a deficient number, since it is larger than the sum of its proper divisors (1).

6446243693 is an equidigital number, since it uses as much as digits as its factorization.

6446243693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 47.

The square root of 6446243693 is about 80288.5028693399. The cubic root of 6446243693 is about 1861.0965604924.

The spelling of 6446243693 in words is "six billion, four hundred forty-six million, two hundred forty-three thousand, six hundred ninety-three".