664551561105255 has 32 divisors (see below), whose sum is σ = 1118590587993600. Its totient is φ = 336405761992832.

The previous prime is 664551561105239. The next prime is 664551561105259. The reversal of 664551561105255 is 552501165155466.

It is not a de Polignac number, because 664551561105255 - 2⁴ = 664551561105239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664551561105195 and 664551561105204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664551561105259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12946624659 + ... + 12946675988.

It is an arithmetic number, because the mean of its divisors is an integer number (34955955874800).

Almost surely, 2^{664551561105255} is an apocalyptic number.

664551561105255 is a deficient number, since it is larger than the sum of its proper divisors (454039026888345).

664551561105255 is a wasteful number, since it uses less digits than its factorization.

664551561105255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25893300743.

The product of its (nonzero) digits is 27000000, while the sum is 57.

The spelling of 664551561105255 in words is "six hundred sixty-four trillion, five hundred fifty-one billion, five hundred sixty-one million, one hundred five thousand, two hundred fifty-five".