643111301331 has 12 divisors (see below), whose sum is σ = 929065736560. Its totient is φ = 428682164400.

The previous prime is 643111301317. The next prime is 643111301347. The reversal of 643111301331 is 133103111346.

643111301331 is a `hidden beast` number, since 6 + 4 + 311 + 13 + 0 + 1 + 331 = 666.

It is not a de Polignac number, because 643111301331 - 2¹¹ = 643111299283 is a prime.

It is a super-2 number, since 2×643111301331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643111301295 and 643111301304.

It is not an unprimeable number, because it can be changed into a prime (643111301311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4822495 + ... + 4954056.

Almost surely, 2^643111301331 is an apocalyptic number.

643111301331 is a deficient number, since it is larger than the sum of its proper divisors (285954435229).

643111301331 is a wasteful number, since it uses less digits than its factorization.

643111301331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9783866 (or 9783863 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

Adding to 643111301331 its reverse (133103111346), we get a palindrome (776214412677).

The spelling of 643111301331 in words is "six hundred forty-three billion, one hundred eleven million, three hundred one thousand, three hundred thirty-one".