664155441 has 12 divisors (see below), whose sum is σ = 959563332. Its totient is φ = 442665216.

The previous prime is 664155413. The next prime is 664155467. The reversal of 664155441 is 144551466.

664155441 is a `hidden beast` number, since 6 + 64 + 1 + 554 + 41 = 666.

664155441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 645363216 + 18792225 = 25404^2 + 4335^2 .

It is not a de Polignac number, because 664155441 - 2¹⁵ = 664122673 is a prime.

It is a super-2 number, since 2×664155441² = 882204899619808962, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 664155396 and 664155405.

It is not an unprimeable number, because it can be changed into a prime (664155491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58285 + ... + 68741.

It is an arithmetic number, because the mean of its divisors is an integer number (79963611).

Almost surely, 2^664155441 is an apocalyptic number.

It is an amenable number.

664155441 is a deficient number, since it is larger than the sum of its proper divisors (295407891).

664155441 is a wasteful number, since it uses less digits than its factorization.

664155441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17520 (or 17517 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 664155441 is about 25771.2134172995. The cubic root of 664155441 is about 872.4822057493.

The spelling of 664155441 in words is "six hundred sixty-four million, one hundred fifty-five thousand, four hundred forty-one".