664710364691 has 2 divisors, whose sum is σ = 664710364692. Its totient is φ = 664710364690.

The previous prime is 664710364631. The next prime is 664710364727. The reversal of 664710364691 is 196463017466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664710364691 - 2³⁰ = 663636622867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (664710364621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332355182345 + 332355182346.

It is an arithmetic number, because the mean of its divisors is an integer number (332355182346).

Almost surely, 2^664710364691 is an apocalyptic number.

664710364691 is a deficient number, since it is larger than the sum of its proper divisors (1).

664710364691 is an equidigital number, since it uses as much as digits as its factorization.

664710364691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 664710364691 in words is "six hundred sixty-four billion, seven hundred ten million, three hundred sixty-four thousand, six hundred ninety-one".