646440611 has 2 divisors, whose sum is σ = 646440612. Its totient is φ = 646440610.

The previous prime is 646440593. The next prime is 646440637. The reversal of 646440611 is 116044646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646440611 - 2¹⁴ = 646424227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (646440671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323220305 + 323220306.

It is an arithmetic number, because the mean of its divisors is an integer number (323220306).

Almost surely, 2^646440611 is an apocalyptic number.

646440611 is a deficient number, since it is larger than the sum of its proper divisors (1).

646440611 is an equidigital number, since it uses as much as digits as its factorization.

646440611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 646440611 is about 25425.1963807558. The cubic root of 646440611 is about 864.6550401475.

The spelling of 646440611 in words is "six hundred forty-six million, four hundred forty thousand, six hundred eleven".