664977463920 has 600 divisors, whose sum is σ = 2901295992672. Its totient is φ = 138175994880.

The previous prime is 664977463889. The next prime is 664977463939. The reversal of 664977463920 is 29364779466.

664977463920 is a `hidden beast` number, since 6 + 64 + 97 + 7 + 463 + 9 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 5427982 + ... + 5549138.

Almost surely, 2^664977463920 is an apocalyptic number.

664977463920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664977463920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1450647996336).

664977463920 is an abundant number, since it is smaller than the sum of its proper divisors (2236318528752).

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

664977463920 is a wasteful number, since it uses less digits than its factorization.

664977463920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121211 (or 121185 counting only the distinct ones).

The product of its (nonzero) digits is 82301184, while the sum is 63.

The spelling of 664977463920 in words is "six hundred sixty-four billion, nine hundred seventy-seven million, four hundred sixty-three thousand, nine hundred twenty".