664208244491 has 8 divisors (see below), whose sum is σ = 724604802624. Its totient is φ = 603814018120.

The previous prime is 664208244473. The next prime is 664208244527. The reversal of 664208244491 is 194442802466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664208244491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664208244691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41780 + ... + 1153326.

It is an arithmetic number, because the mean of its divisors is an integer number (90575600328).

Almost surely, 2^664208244491 is an apocalyptic number.

664208244491 is a deficient number, since it is larger than the sum of its proper divisors (60396558133).

664208244491 is a wasteful number, since it uses less digits than its factorization.

664208244491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165881.

The product of its (nonzero) digits is 2654208, while the sum is 50.

The spelling of 664208244491 in words is "six hundred sixty-four billion, two hundred eight million, two hundred forty-four thousand, four hundred ninety-one".