641218857198 has 16 divisors (see below), whose sum is σ = 1290930681216. Its totient is φ = 212324124600.

The previous prime is 641218857173. The next prime is 641218857239. The reversal of 641218857198 is 891758812146.

It is a super-2 number, since 2×641218857198² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353872636 + ... + 353874447.

It is an arithmetic number, because the mean of its divisors is an integer number (80683167576).

Almost surely, 2^641218857198 is an apocalyptic number.

641218857198 is an abundant number, since it is smaller than the sum of its proper divisors (649711824018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641218857198 is a wasteful number, since it uses less digits than its factorization.

641218857198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707747239.

The product of its digits is 7741440, while the sum is 60.

The spelling of 641218857198 in words is "six hundred forty-one billion, two hundred eighteen million, eight hundred fifty-seven thousand, one hundred ninety-eight".