6646463491 has 2 divisors, whose sum is σ = 6646463492. Its totient is φ = 6646463490.

The previous prime is 6646463477. The next prime is 6646463539. The reversal of 6646463491 is 1943646466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6646463491 - 2⁷ = 6646463363 is a prime.

It is not a weakly prime, because it can be changed into another prime (6646463441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323231745 + 3323231746.

It is an arithmetic number, because the mean of its divisors is an integer number (3323231746).

Almost surely, 2^6646463491 is an apocalyptic number.

6646463491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646463491 is an equidigital number, since it uses as much as digits as its factorization.

6646463491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 49.

The square root of 6646463491 is about 81525.8455399268. The cubic root of 6646463491 is about 1880.1689423967.

The spelling of 6646463491 in words is "six billion, six hundred forty-six million, four hundred sixty-three thousand, four hundred ninety-one".