643574853216 has 72 divisors (see below), whose sum is σ = 1889203627584. Its totient is φ = 207604788480.

The previous prime is 643574853143. The next prime is 643574853331. The reversal of 643574853216 is 612358475346.

643574853216 is a `hidden beast` number, since 6 + 4 + 3 + 57 + 48 + 532 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36033571 + ... + 36051426.

It is an arithmetic number, because the mean of its divisors is an integer number (26238939272).

Almost surely, 2^643574853216 is an apocalyptic number.

It is an amenable number.

643574853216 is an abundant number, since it is smaller than the sum of its proper divisors (1245628774368).

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

643574853216 is a wasteful number, since it uses less digits than its factorization.

643574853216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72085044 (or 72085033 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 54.

The spelling of 643574853216 in words is "six hundred forty-three billion, five hundred seventy-four million, eight hundred fifty-three thousand, two hundred sixteen".