664041361 has 9 divisors (see below), whose sum is σ = 675175089. Its totient is φ = 653089536.

The previous prime is 664041347. The next prime is 664041383. The reversal of 664041361 is 163140466.

The square root of 664041361 is 25769.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 463761 + 663577600 = 681^2 + 25760^2 .

It is not a de Polignac number, because 664041361 - 2⁹ = 664040849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664041461) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1880961 + ... + 1881313.

Almost surely, 2^664041361 is an apocalyptic number.

664041361 is the 25769-th square number.

664041361 is the 12885-th centered octagonal number.

It is an amenable number.

664041361 is a deficient number, since it is larger than the sum of its proper divisors (11133728).

664041361 is an frugal number, since it uses more digits than its factorization.

664041361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The cubic root of 664041361 is about 872.4322483330.

The spelling of 664041361 in words is "six hundred sixty-four million, forty-one thousand, three hundred sixty-one".