664662340442643 has 16 divisors (see below), whose sum is σ = 924752241582336. Its totient is φ = 423840526361120.

The previous prime is 664662340442621. The next prime is 664662340442651. The reversal of 664662340442643 is 346244043266466.

It is a cyclic number.

It is not a de Polignac number, because 664662340442643 - 2⁶ = 664662340442579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664662340442693) 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, 10237113 + ... + 37869818.

It is an arithmetic number, because the mean of its divisors is an integer number (57797015098896).

Almost surely, 2^{664662340442643} is an apocalyptic number.

664662340442643 is a deficient number, since it is larger than the sum of its proper divisors (260089901139693).

664662340442643 is a wasteful number, since it uses less digits than its factorization.

664662340442643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48307194.

The product of its (nonzero) digits is 286654464, while the sum is 60.

The spelling of 664662340442643 in words is "six hundred sixty-four trillion, six hundred sixty-two billion, three hundred forty million, four hundred forty-two thousand, six hundred forty-three".