641751836168 has 16 divisors (see below), whose sum is σ = 1204263787500. Its totient is φ = 320614826176.

The previous prime is 641751836093. The next prime is 641751836171. The reversal of 641751836168 is 861638157146.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 554878989604 + 86872846564 = 744902^2 + 294742^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32626043 + ... + 32645706.

Almost surely, 2^641751836168 is an apocalyptic number.

It is an amenable number.

641751836168 is a deficient number, since it is larger than the sum of its proper divisors (562511951332).

641751836168 is a wasteful number, since it uses less digits than its factorization.

641751836168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65272984 (or 65272980 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 56.

The spelling of 641751836168 in words is "six hundred forty-one billion, seven hundred fifty-one million, eight hundred thirty-six thousand, one hundred sixty-eight".