3217718391945 has 8 divisors (see below), whose sum is σ = 5148349427136. Its totient is φ = 1716116475696.

The previous prime is 3217718391941. The next prime is 3217718391959. The reversal of 3217718391945 is 5491938177123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3217718391945 - 2² = 3217718391941 is a prime.

It is a super-2 number, since 2×3217718391945² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3217718391941) 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 7 ways as a sum of consecutive naturals, for example, 107257279717 + ... + 107257279746.

It is an arithmetic number, because the mean of its divisors is an integer number (643543678392).

Almost surely, 2^{3217718391945} is an apocalyptic number.

It is an amenable number.

3217718391945 is a deficient number, since it is larger than the sum of its proper divisors (1930631035191).

3217718391945 is a wasteful number, since it uses less digits than its factorization.

3217718391945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214514559471.

The product of its digits is 11430720, while the sum is 60.

The spelling of 3217718391945 in words is "three trillion, two hundred seventeen billion, seven hundred eighteen million, three hundred ninety-one thousand, nine hundred forty-five".