664801796984 has 64 divisors (see below), whose sum is σ = 1393060183200. Its totient is φ = 295316227584.

The previous prime is 664801796977. The next prime is 664801797007. The reversal of 664801796984 is 489697108466.

It is a super-2 number, since 2×664801796984² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 608399 + ... + 1303745.

Almost surely, 2^664801796984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664801796984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (696530091600).

664801796984 is an abundant number, since it is smaller than the sum of its proper divisors (728258386216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664801796984 is a wasteful number, since it uses less digits than its factorization.

664801796984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695712 (or 695708 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 68.

The spelling of 664801796984 in words is "six hundred sixty-four billion, eight hundred one million, seven hundred ninety-six thousand, nine hundred eighty-four".