641853518543744 has 64 divisors (see below), whose sum is σ = 1377063606796080. Its totient is φ = 296237916057600.

The previous prime is 641853518543729. The next prime is 641853518543747. The reversal of 641853518543744 is 447345815358146.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641853518543747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238077539 + ... + 240758429.

Almost surely, 2^{641853518543744} is an apocalyptic number.

641853518543744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

641853518543744 is an abundant number, since it is smaller than the sum of its proper divisors (735210088252336).

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

641853518543744 is a wasteful number, since it uses less digits than its factorization.

641853518543744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824799 (or 2824787 counting only the distinct ones).

The product of its digits is 774144000, while the sum is 68.

The spelling of 641853518543744 in words is "six hundred forty-one trillion, eight hundred fifty-three billion, five hundred eighteen million, five hundred forty-three thousand, seven hundred forty-four".