643556160441 has 6 divisors (see below), whose sum is σ = 929581120650. Its totient is φ = 429037440288.

The previous prime is 643556160439. The next prime is 643556160449. The reversal of 643556160441 is 144061655346.

643556160441 is a `hidden beast` number, since 6 + 4 + 35 + 5 + 6 + 1 + 604 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 627111945216 + 16444215225 = 791904^2 + 128235^2 .

It is not a de Polignac number, because 643556160441 - 2¹ = 643556160439 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (643556160449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35753120016 + ... + 35753120033.

It is an arithmetic number, because the mean of its divisors is an integer number (154930186775).

Almost surely, 2^643556160441 is an apocalyptic number.

It is an amenable number.

643556160441 is a deficient number, since it is larger than the sum of its proper divisors (286024960209).

643556160441 is a wasteful number, since it uses less digits than its factorization.

643556160441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71506240055 (or 71506240052 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 643556160441 in words is "six hundred forty-three billion, five hundred fifty-six million, one hundred sixty thousand, four hundred forty-one".