641805849112 has 8 divisors (see below), whose sum is σ = 1203385967100. Its totient is φ = 320902924552.

The previous prime is 641805849107. The next prime is 641805849127. The reversal of 641805849112 is 211948508146.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×641805849112² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40112865562 + ... + 40112865577.

Almost surely, 2^641805849112 is an apocalyptic number.

It is an amenable number.

641805849112 is a deficient number, since it is larger than the sum of its proper divisors (561580117988).

641805849112 is a wasteful number, since it uses less digits than its factorization.

641805849112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80225731145 (or 80225731141 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 49.

The spelling of 641805849112 in words is "six hundred forty-one billion, eight hundred five million, eight hundred forty-nine thousand, one hundred twelve".