3218685350381 has 4 divisors (see below), whose sum is σ = 3297189871164. Its totient is φ = 3140180829600.

The previous prime is 3218685350339. The next prime is 3218685350401. The reversal of 3218685350381 is 1830535868123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1688528720356 + 1530156630025 = 1299434^2 + 1236995^2 .

It is a cyclic number.

It is not a de Polignac number, because 3218685350381 - 2²² = 3218681156077 is a prime.

It is a super-2 number, since 2×3218685350381² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3218685350311) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 39252260330 + ... + 39252260411.

It is an arithmetic number, because the mean of its divisors is an integer number (824297467791).

Almost surely, 2^{3218685350381} is an apocalyptic number.

It is an amenable number.

3218685350381 is a deficient number, since it is larger than the sum of its proper divisors (78504520783).

3218685350381 is an equidigital number, since it uses as much as digits as its factorization.

3218685350381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78504520782.

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 3218685350381 in words is "three trillion, two hundred eighteen billion, six hundred eighty-five million, three hundred fifty thousand, three hundred eighty-one".