3218855391609 has 16 divisors (see below), whose sum is σ = 5042123131584. Its totient is φ = 1800758260800.

The previous prime is 3218855391571. The next prime is 3218855391613. The reversal of 3218855391609 is 9061935588123.

It is not a de Polignac number, because 3218855391609 - 2⁹ = 3218855391097 is a prime.

It is a super-2 number, since 2×3218855391609² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3218855391509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3751579282 + ... + 3751580139.

It is an arithmetic number, because the mean of its divisors is an integer number (315132695724).

Almost surely, 2^{3218855391609} is an apocalyptic number.

3218855391609 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

3218855391609 is a deficient number, since it is larger than the sum of its proper divisors (1823267739975).

3218855391609 is a wasteful number, since it uses less digits than its factorization.

3218855391609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7503159448.

The product of its (nonzero) digits is 13996800, while the sum is 60.

The spelling of 3218855391609 in words is "three trillion, two hundred eighteen billion, eight hundred fifty-five million, three hundred ninety-one thousand, six hundred nine".