664576345756641 has 8 divisors (see below), whose sum is σ = 914685723192064. Its totient is φ = 428758932746160.

The previous prime is 664576345756637. The next prime is 664576345756679. The reversal of 664576345756641 is 146657543675466.

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

It is not a de Polignac number, because 664576345756641 - 2² = 664576345756637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664576345756691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3572991106126 + ... + 3572991106311.

It is an arithmetic number, because the mean of its divisors is an integer number (114335715399008).

Almost surely, 2^{664576345756641} is an apocalyptic number.

It is an amenable number.

664576345756641 is a deficient number, since it is larger than the sum of its proper divisors (250109377435423).

664576345756641 is a wasteful number, since it uses less digits than its factorization.

664576345756641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7145982212471.

The product of its digits is 9144576000, while the sum is 75.

The spelling of 664576345756641 in words is "six hundred sixty-four trillion, five hundred seventy-six billion, three hundred forty-five million, seven hundred fifty-six thousand, six hundred forty-one".