6467442781 has 2 divisors, whose sum is σ = 6467442782. Its totient is φ = 6467442780.

The previous prime is 6467442767. The next prime is 6467442803. The reversal of 6467442781 is 1872447646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5036031225 + 1431411556 = 70965^2 + 37834^2 .

It is a cyclic number.

It is not a de Polignac number, because 6467442781 - 2²¹ = 6465345629 is a prime.

It is a super-2 number, since 2×6467442781² = 83655632251018027922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6467442701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3233721390 + 3233721391.

It is an arithmetic number, because the mean of its divisors is an integer number (3233721391).

Almost surely, 2^6467442781 is an apocalyptic number.

It is an amenable number.

6467442781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6467442781 is an equidigital number, since it uses as much as digits as its factorization.

6467442781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1806336, while the sum is 49.

The square root of 6467442781 is about 80420.4127134399. The cubic root of 6467442781 is about 1863.1344594384.

The spelling of 6467442781 in words is "six billion, four hundred sixty-seven million, four hundred forty-two thousand, seven hundred eighty-one".