664742345 has 8 divisors (see below), whose sum is σ = 801175560. Its totient is φ = 529470720.

The previous prime is 664742249. The next prime is 664742359. The reversal of 664742345 is 543247466.

It can be written as a sum of positive squares in 4 ways, for example, as 374925769 + 289816576 = 19363^2 + 17024^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664742345 - 2¹⁰ = 664741321 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289136 + ... + 291425.

It is an arithmetic number, because the mean of its divisors is an integer number (100146945).

Almost surely, 2^664742345 is an apocalyptic number.

It is an amenable number.

664742345 is a deficient number, since it is larger than the sum of its proper divisors (136433215).

664742345 is a wasteful number, since it uses less digits than its factorization.

664742345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580795.

The product of its digits is 483840, while the sum is 41.

The square root of 664742345 is about 25782.5977162892. The cubic root of 664742345 is about 872.7391298089.

The spelling of 664742345 in words is "six hundred sixty-four million, seven hundred forty-two thousand, three hundred forty-five".