646404460441 has 2 divisors, whose sum is σ = 646404460442. Its totient is φ = 646404460440.

The previous prime is 646404460433. The next prime is 646404460469. The reversal of 646404460441 is 144064404646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 646287366400 + 117094041 = 803920^2 + 10821^2 .

It is a cyclic number.

It is not a de Polignac number, because 646404460441 - 2³ = 646404460433 is a prime.

It is not a weakly prime, because it can be changed into another prime (646404260441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323202230220 + 323202230221.

It is an arithmetic number, because the mean of its divisors is an integer number (323202230221).

Almost surely, 2^646404460441 is an apocalyptic number.

It is an amenable number.

646404460441 is a deficient number, since it is larger than the sum of its proper divisors (1).

646404460441 is an equidigital number, since it uses as much as digits as its factorization.

646404460441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 884736, while the sum is 43.

The spelling of 646404460441 in words is "six hundred forty-six billion, four hundred four million, four hundred sixty thousand, four hundred forty-one".