641783640996 has 27 divisors (see below), whose sum is σ = 1622298576171. Its totient is φ = 213926278104.

The previous prime is 641783640983. The next prime is 641783641021. The reversal of 641783640996 is 699046387146.

The square root of 641783640996 is 801114.

It is a perfect power (a square), and thus also a powerful number.

641783640996 is a `hidden beast` number, since 6 + 41 + 78 + 36 + 409 + 96 = 666.

It is a super-2 number, since 2×641783640996² (a number of 24 digits) contains 22 as substring.

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 8 ways as a sum of consecutive naturals, for example, 4739925 + ... + 4873443.

Almost surely, 2^641783640996 is an apocalyptic number.

641783640996 is the 801114-th square number.

It is an amenable number.

641783640996 is an abundant number, since it is smaller than the sum of its proper divisors (980514935175).

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

641783640996 is an frugal number, since it uses more digits than its factorization.

641783640996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267048 (or 133524 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 63.

The spelling of 641783640996 in words is "six hundred forty-one billion, seven hundred eighty-three million, six hundred forty thousand, nine hundred ninety-six".