664452441 has 6 divisors (see below), whose sum is σ = 959764650. Its totient is φ = 442968288.

The previous prime is 664452427. The next prime is 664452479. The reversal of 664452441 is 144254466.

664452441 is a `hidden beast` number, since 6 + 644 + 5 + 2 + 4 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 633982041 + 30470400 = 25179^2 + 5520^2 .

It is not a de Polignac number, because 664452441 - 2¹⁵ = 664419673 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 664452396 and 664452405.

It is not an unprimeable number, because it can be changed into a prime (664452491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36914016 + ... + 36914033.

It is an arithmetic number, because the mean of its divisors is an integer number (159960775).

Almost surely, 2^664452441 is an apocalyptic number.

It is an amenable number.

664452441 is a deficient number, since it is larger than the sum of its proper divisors (295312209).

664452441 is a wasteful number, since it uses less digits than its factorization.

664452441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73828055 (or 73828052 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 664452441 is about 25776.9750164755. The cubic root of 664452441 is about 872.6122398662.

It can be divided in two parts, 66445 and 2441, that added together give a palindrome (68886).

The spelling of 664452441 in words is "six hundred sixty-four million, four hundred fifty-two thousand, four hundred forty-one".