643453770501 has 12 divisors (see below), whose sum is σ = 929600070828. Its totient is φ = 428892174144.

The previous prime is 643453770457. The next prime is 643453770503. The reversal of 643453770501 is 105077354346.

643453770501 is a `hidden beast` number, since 6 + 4 + 3 + 45 + 37 + 70 + 501 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 258520385601 + 384933384900 = 508449^2 + 620430^2 .

It is not a de Polignac number, because 643453770501 - 2⁶ = 643453770437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643453770503) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 6364240 + ... + 6464553.

It is an arithmetic number, because the mean of its divisors is an integer number (77466672569).

Almost surely, 2^643453770501 is an apocalyptic number.

It is an amenable number.

643453770501 is a deficient number, since it is larger than the sum of its proper divisors (286146300327).

643453770501 is a wasteful number, since it uses less digits than its factorization.

643453770501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12834372 (or 12834369 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 45.

The spelling of 643453770501 in words is "six hundred forty-three billion, four hundred fifty-three million, seven hundred seventy thousand, five hundred one".