664561007536735 has 8 divisors (see below), whose sum is σ = 799771402732176. Its totient is φ = 530116676904000.

The previous prime is 664561007536669. The next prime is 664561007536763. The reversal of 664561007536735 is 537635700165466.

664561007536735 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 664561007536735 - 2⁷ = 664561007536607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191516138766 + ... + 191516142235.

It is an arithmetic number, because the mean of its divisors is an integer number (99971425341522).

Almost surely, 2^{664561007536735} is an apocalyptic number.

664561007536735 is a deficient number, since it is larger than the sum of its proper divisors (135210395195441).

664561007536735 is a wasteful number, since it uses less digits than its factorization.

664561007536735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383032281353.

The product of its (nonzero) digits is 285768000, while the sum is 64.

The spelling of 664561007536735 in words is "six hundred sixty-four trillion, five hundred sixty-one billion, seven million, five hundred thirty-six thousand, seven hundred thirty-five".