664286705 has 4 divisors (see below), whose sum is σ = 797144052. Its totient is φ = 531429360.

The previous prime is 664286681. The next prime is 664286729. The reversal of 664286705 is 507682466.

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

It is an interprime number because it is at equal distance from previous prime (664286681) and next prime (664286729).

It can be written as a sum of positive squares in 2 ways, for example, as 82319329 + 581967376 = 9073^2 + 24124^2 .

It is not a de Polignac number, because 664286705 - 2¹⁶ = 664221169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66428666 + ... + 66428675.

It is an arithmetic number, because the mean of its divisors is an integer number (199286013).

Almost surely, 2^664286705 is an apocalyptic number.

It is an amenable number.

664286705 is a deficient number, since it is larger than the sum of its proper divisors (132857347).

664286705 is a wasteful number, since it uses less digits than its factorization.

664286705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132857346.

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 664286705 is about 25773.7600089704. The cubic root of 664286705 is about 872.5396812302.

The spelling of 664286705 in words is "six hundred sixty-four million, two hundred eighty-six thousand, seven hundred five".