643061301313 has 8 divisors (see below), whose sum is σ = 646752482696. Its totient is φ = 639373824000.

The previous prime is 643061301263. The next prime is 643061301319. The reversal of 643061301313 is 313103160346.

It can be written as a sum of positive squares in 4 ways, for example, as 109910151729 + 533151149584 = 331527^2 + 730172^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643061301313 - 2⁹ = 643061300801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643061301319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577428 + ... + 1272613.

It is an arithmetic number, because the mean of its divisors is an integer number (80844060337).

Almost surely, 2^643061301313 is an apocalyptic number.

It is an amenable number.

643061301313 is a deficient number, since it is larger than the sum of its proper divisors (3691181383).

643061301313 is a wasteful number, since it uses less digits than its factorization.

643061301313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852035.

The product of its (nonzero) digits is 11664, while the sum is 31.

Adding to 643061301313 its reverse (313103160346), we get a palindrome (956164461659).

The spelling of 643061301313 in words is "six hundred forty-three billion, sixty-one million, three hundred one thousand, three hundred thirteen".