664821006837 has 8 divisors (see below), whose sum is σ = 954614779104. Its totient is φ = 409120619568.

The previous prime is 664821006791. The next prime is 664821006853. The reversal of 664821006837 is 738600128466.

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

It is not a de Polignac number, because 664821006837 - 2⁷ = 664821006709 is a prime.

It is a super-2 number, since 2×664821006837² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664821006837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664821076837) 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, 8523346203 + ... + 8523346280.

It is an arithmetic number, because the mean of its divisors is an integer number (119326847388).

Almost surely, 2^664821006837 is an apocalyptic number.

It is an amenable number.

664821006837 is a deficient number, since it is larger than the sum of its proper divisors (289793772267).

664821006837 is a wasteful number, since it uses less digits than its factorization.

664821006837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17046692499.

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 664821006837 in words is "six hundred sixty-four billion, eight hundred twenty-one million, six thousand, eight hundred thirty-seven".