6466646009 has 2 divisors, whose sum is σ = 6466646010. Its totient is φ = 6466646008.

The previous prime is 6466645979. The next prime is 6466646033. The reversal of 6466646009 is 9006466646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5061895609 + 1404750400 = 71147^2 + 37480^2 .

It is a cyclic number.

It is not a de Polignac number, because 6466646009 - 2¹² = 6466641913 is a prime.

It is not a weakly prime, because it can be changed into another prime (6466646059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3233323004 + 3233323005.

It is an arithmetic number, because the mean of its divisors is an integer number (3233323005).

Almost surely, 2^6466646009 is an apocalyptic number.

It is an amenable number.

6466646009 is a deficient number, since it is larger than the sum of its proper divisors (1).

6466646009 is an equidigital number, since it uses as much as digits as its factorization.

6466646009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 47.

The square root of 6466646009 is about 80415.4587688213. The cubic root of 6466646009 is about 1863.0579452021.

The spelling of 6466646009 in words is "six billion, four hundred sixty-six million, six hundred forty-six thousand, nine".