643101345 has 24 divisors (see below), whose sum is σ = 1132987752. Its totient is φ = 337363200.

The previous prime is 643101343. The next prime is 643101383. The reversal of 643101345 is 543101346.

643101345 is a `hidden beast` number, since 6 + 4 + 310 + 1 + 345 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 98485776 + 544615569 = 9924^2 + 23337^2 .

It is not a de Polignac number, because 643101345 - 2¹ = 643101343 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (643101343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114396 + ... + 119885.

It is an arithmetic number, because the mean of its divisors is an integer number (47207823).

Almost surely, 2^643101345 is an apocalyptic number.

It is an amenable number.

643101345 is a deficient number, since it is larger than the sum of its proper divisors (489886407).

643101345 is a wasteful number, since it uses less digits than its factorization.

643101345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234353 (or 234350 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 643101345 is about 25359.4429158055. The cubic root of 643101345 is about 863.1636429840.

Subtracting from 643101345 its reverse (543101346), we obtain a palindrome (99999999).

The spelling of 643101345 in words is "six hundred forty-three million, one hundred one thousand, three hundred forty-five".