664041344649 has 16 divisors (see below), whose sum is σ = 891379643520. Its totient is φ = 439699478400.

The previous prime is 664041344633. The next prime is 664041344671. The reversal of 664041344649 is 946443140466.

It is not a de Polignac number, because 664041344649 - 2⁴ = 664041344633 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664041344689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3173349 + ... + 3376125.

It is an arithmetic number, because the mean of its divisors is an integer number (55711227720).

Almost surely, 2^664041344649 is an apocalyptic number.

It is an amenable number.

664041344649 is a deficient number, since it is larger than the sum of its proper divisors (227338298871).

664041344649 is a wasteful number, since it uses less digits than its factorization.

664041344649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210160.

The product of its (nonzero) digits is 5971968, while the sum is 51.

The spelling of 664041344649 in words is "six hundred sixty-four billion, forty-one million, three hundred forty-four thousand, six hundred forty-nine".