664400413 has 4 divisors (see below), whose sum is σ = 678536640. Its totient is φ = 650264188.

The previous prime is 664400389. The next prime is 664400423. The reversal of 664400413 is 314004466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664400413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664400423) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7068043 + ... + 7068136.

It is an arithmetic number, because the mean of its divisors is an integer number (169634160).

Almost surely, 2^664400413 is an apocalyptic number.

It is an amenable number.

664400413 is a deficient number, since it is larger than the sum of its proper divisors (14136227).

664400413 is a wasteful number, since it uses less digits than its factorization.

664400413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14136226.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 664400413 is about 25775.9658014981. The cubic root of 664400413 is about 872.5894634908.

Adding to 664400413 its reverse (314004466), we get a palindrome (978404879).

The spelling of 664400413 in words is "six hundred sixty-four million, four hundred thousand, four hundred thirteen".