664907698000 has 640 divisors, whose sum is σ = 2118864384000. Its totient is φ = 195917875200.

The previous prime is 664907697991. The next prime is 664907698033. The reversal of 664907698000 is 896709466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 204020371 + ... + 204023629.

It is an arithmetic number, because the mean of its divisors is an integer number (3310725600).

Almost surely, 2^664907698000 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 664907698000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1059432192000).

664907698000 is an abundant number, since it is smaller than the sum of its proper divisors (1453956686000).

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

664907698000 is a wasteful number, since it uses less digits than its factorization.

664907698000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3380 (or 3364 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 664907698000 in words is "six hundred sixty-four billion, nine hundred seven million, six hundred ninety-eight thousand".