664565565407 has 8 divisors (see below), whose sum is σ = 694489103616. Its totient is φ = 635299687512.

The previous prime is 664565565401. The next prime is 664565565431. The reversal of 664565565407 is 704565565466.

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 664565565407 - 2²⁰ = 664564516831 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 (664565565401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164413013 + ... + 164417054.

It is an arithmetic number, because the mean of its divisors is an integer number (86811137952).

Almost surely, 2^664565565407 is an apocalyptic number.

664565565407 is a deficient number, since it is larger than the sum of its proper divisors (29923538209).

664565565407 is a wasteful number, since it uses less digits than its factorization.

664565565407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328830157.

The product of its (nonzero) digits is 90720000, while the sum is 59.

Adding to 664565565407 its sum of digits (59), we get a palindrome (664565565466).

The spelling of 664565565407 in words is "six hundred sixty-four billion, five hundred sixty-five million, five hundred sixty-five thousand, four hundred seven".