664666465 has 8 divisors (see below), whose sum is σ = 809504640. Its totient is φ = 523796592.

The previous prime is 664666463. The next prime is 664666477. The reversal of 664666465 is 564666466.

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

It is a cyclic number.

It is not a de Polignac number, because 664666465 - 2¹ = 664666463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664666463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991705 + ... + 992374.

It is an arithmetic number, because the mean of its divisors is an integer number (101188080).

Almost surely, 2^664666465 is an apocalyptic number.

It is an amenable number.

664666465 is a deficient number, since it is larger than the sum of its proper divisors (144838175).

664666465 is a wasteful number, since it uses less digits than its factorization.

664666465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984151.

The product of its digits is 3732480, while the sum is 49.

The square root of 664666465 is about 25781.1261390964. The cubic root of 664666465 is about 872.7059209696.

Subtracting from 664666465 its reverse (564666466), we obtain a palindrome (99999999).

The spelling of 664666465 in words is "six hundred sixty-four million, six hundred sixty-six thousand, four hundred sixty-five".