326155639680 has 384 divisors, whose sum is σ = 1214061095520. Its totient is φ = 80207069184.

The previous prime is 326155639657. The next prime is 326155639687. The reversal of 326155639680 is 86936551623.

It is a happy number.

326155639680 is a `hidden beast` number, since 3 + 2 + 6 + 1 + 556 + 3 + 9 + 6 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326155639687) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139799794 + ... + 139802126.

Almost surely, 2^326155639680 is an apocalyptic number.

326155639680 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 326155639680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (607030547760).

326155639680 is an abundant number, since it is smaller than the sum of its proper divisors (887905455840).

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

326155639680 is a wasteful number, since it uses less digits than its factorization.

326155639680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4238 (or 4223 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 326155639680 in words is "three hundred twenty-six billion, one hundred fifty-five million, six hundred thirty-nine thousand, six hundred eighty".