6446259247 has 2 divisors, whose sum is σ = 6446259248. Its totient is φ = 6446259246.

The previous prime is 6446259221. The next prime is 6446259263. The reversal of 6446259247 is 7429526446.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6446259247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6446259247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6446259647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3223129623 + 3223129624.

It is an arithmetic number, because the mean of its divisors is an integer number (3223129624).

Almost surely, 2^6446259247 is an apocalyptic number.

6446259247 is a deficient number, since it is larger than the sum of its proper divisors (1).

6446259247 is an equidigital number, since it uses as much as digits as its factorization.

6446259247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 49.

The square root of 6446259247 is about 80288.5997324651. The cubic root of 6446259247 is about 1861.0980573576.

The spelling of 6446259247 in words is "six billion, four hundred forty-six million, two hundred fifty-nine thousand, two hundred forty-seven".