664061345 has 4 divisors (see below), whose sum is σ = 796873620. Its totient is φ = 531249072.

The previous prime is 664061339. The next prime is 664061347. The reversal of 664061345 is 543160466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 179533201 + 484528144 = 13399^2 + 22012^2 .

It is a cyclic number.

It is not a de Polignac number, because 664061345 - 2⁴ = 664061329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664061347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66406130 + ... + 66406139.

It is an arithmetic number, because the mean of its divisors is an integer number (199218405).

Almost surely, 2^664061345 is an apocalyptic number.

It is an amenable number.

664061345 is a deficient number, since it is larger than the sum of its proper divisors (132812275).

664061345 is a wasteful number, since it uses less digits than its factorization.

664061345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132812274.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 664061345 is about 25769.3877498089. The cubic root of 664061345 is about 872.4410000525.

The spelling of 664061345 in words is "six hundred sixty-four million, sixty-one thousand, three hundred forty-five".