326355785781 has 16 divisors (see below), whose sum is σ = 445363446528. Its totient is φ = 212479409600.

The previous prime is 326355785729. The next prime is 326355785809. The reversal of 326355785781 is 187587553623.

It is a cyclic number.

It is not a de Polignac number, because 326355785781 - 2⁷ = 326355785653 is a prime.

It is a super-2 number, since 2×326355785781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326355785711) by changing a digit.

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, 2445390 + ... + 2575391.

It is an arithmetic number, because the mean of its divisors is an integer number (27835215408).

Almost surely, 2^326355785781 is an apocalyptic number.

It is an amenable number.

326355785781 is a deficient number, since it is larger than the sum of its proper divisors (119007660747).

326355785781 is a wasteful number, since it uses less digits than its factorization.

326355785781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5021292.

The product of its digits is 42336000, while the sum is 60.

The spelling of 326355785781 in words is "three hundred twenty-six billion, three hundred fifty-five million, seven hundred eighty-five thousand, seven hundred eighty-one".