643661253325147 has 2 divisors, whose sum is σ = 643661253325148. Its totient is φ = 643661253325146.

The previous prime is 643661253325141. The next prime is 643661253325229. The reversal of 643661253325147 is 741523352166346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643661253325147 - 2¹⁹ = 643661252800859 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643661253325091 and 643661253325100.

It is not a weakly prime, because it can be changed into another prime (643661253325141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321830626662573 + 321830626662574.

It is an arithmetic number, because the mean of its divisors is an integer number (321830626662574).

Almost surely, 2^{643661253325147} is an apocalyptic number.

643661253325147 is a deficient number, since it is larger than the sum of its proper divisors (1).

643661253325147 is an equidigital number, since it uses as much as digits as its factorization.

643661253325147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65318400, while the sum is 58.

The spelling of 643661253325147 in words is "six hundred forty-three trillion, six hundred sixty-one billion, two hundred fifty-three million, three hundred twenty-five thousand, one hundred forty-seven".