326664683520 has 768 divisors, whose sum is σ = 1265620308480. Its totient is φ = 70467452928.

The previous prime is 326664683503. The next prime is 326664683533. The reversal of 326664683520 is 25386466623.

It is a tau number, because it is divible by the number of its divisors (768).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1242070909 + ... + 1242071171.

It is an arithmetic number, because the mean of its divisors is an integer number (1647943110).

Almost surely, 2^326664683520 is an apocalyptic number.

326664683520 is a gapful number since it is divisible by the number (30) 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 326664683520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (632810154240).

326664683520 is an abundant number, since it is smaller than the sum of its proper divisors (938955624960).

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

326664683520 is an equidigital number, since it uses as much as digits as its factorization.

326664683520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 51.

It can be divided in two parts, 3266646 and 83520, that added together give a triangular number (3350166 = T₂₅₈₈).

The spelling of 326664683520 in words is "three hundred twenty-six billion, six hundred sixty-four million, six hundred eighty-three thousand, five hundred twenty".