351991218322 has 32 divisors (see below), whose sum is σ = 570965241600. Its totient is φ = 162246520128.

The previous prime is 351991218287. The next prime is 351991218329. The reversal of 351991218322 is 223812199153.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (351991218329) 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, 506179 + ... + 979897.

It is an arithmetic number, because the mean of its divisors is an integer number (17842663800).

Almost surely, 2^351991218322 is an apocalyptic number.

351991218322 is a deficient number, since it is larger than the sum of its proper divisors (218974023278).

351991218322 is a wasteful number, since it uses less digits than its factorization.

351991218322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474330.

The product of its digits is 233280, while the sum is 46.

It can be divided in two parts, 35199 and 1218322, that added together give a palindrome (1253521).

The spelling of 351991218322 in words is "three hundred fifty-one billion, nine hundred ninety-one million, two hundred eighteen thousand, three hundred twenty-two".