664811395 has 4 divisors (see below), whose sum is σ = 797773680. Its totient is φ = 531849112.

The previous prime is 664811353. The next prime is 664811417. The reversal of 664811395 is 593118466.

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

It is a cyclic number.

It is not a de Polignac number, because 664811395 - 2⁷ = 664811267 is a prime.

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, 66481135 + ... + 66481144.

It is an arithmetic number, because the mean of its divisors is an integer number (199443420).

Almost surely, 2^664811395 is an apocalyptic number.

664811395 is a deficient number, since it is larger than the sum of its proper divisors (132962285).

664811395 is a wasteful number, since it uses less digits than its factorization.

664811395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132962284.

The product of its digits is 155520, while the sum is 43.

The square root of 664811395 is about 25783.9367630314. The cubic root of 664811395 is about 872.7693473064.

It can be divided in two parts, 66481 and 1395, that added together give a palindrome (67876).

The spelling of 664811395 in words is "six hundred sixty-four million, eight hundred eleven thousand, three hundred ninety-five".