664817651409 has 8 divisors (see below), whose sum is σ = 886811136640. Its totient is φ = 443017966896.

The previous prime is 664817651369. The next prime is 664817651413. The reversal of 664817651409 is 904156718466.

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

It is not a de Polignac number, because 664817651409 - 2⁸ = 664817651153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664817651609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48442174 + ... + 48455895.

It is an arithmetic number, because the mean of its divisors is an integer number (110851392080).

Almost surely, 2^664817651409 is an apocalyptic number.

It is an amenable number.

664817651409 is a deficient number, since it is larger than the sum of its proper divisors (221993485231).

664817651409 is a wasteful number, since it uses less digits than its factorization.

664817651409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96900359.

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 664817651409 in words is "six hundred sixty-four billion, eight hundred seventeen million, six hundred fifty-one thousand, four hundred nine".