664551561105195 has 16 divisors (see below), whose sum is σ = 1119244734493440. Its totient is φ = 335773420347744.

The previous prime is 664551561105193. The next prime is 664551561105239. The reversal of 664551561105195 is 591501165155466.

It is not a de Polignac number, because 664551561105195 - 2¹ = 664551561105193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664551561105193) 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, 1165879931479 + ... + 1165879932048.

It is an arithmetic number, because the mean of its divisors is an integer number (69952795905840).

Almost surely, 2^{664551561105195} is an apocalyptic number.

664551561105195 is a deficient number, since it is larger than the sum of its proper divisors (454693173388245).

664551561105195 is a wasteful number, since it uses less digits than its factorization.

664551561105195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331759863554.

The product of its (nonzero) digits is 24300000, while the sum is 60.

The spelling of 664551561105195 in words is "six hundred sixty-four trillion, five hundred fifty-one billion, five hundred sixty-one million, one hundred five thousand, one hundred ninety-five".