643161103 has 6 divisors (see below), whose sum is σ = 696440904. Its totient is φ = 593687016.

The previous prime is 643161067. The next prime is 643161109. The reversal of 643161103 is 301161346.

It is a happy number.

It is not a de Polignac number, because 643161103 - 2⁹ = 643160591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643161109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1902675 + ... + 1903012.

It is an arithmetic number, because the mean of its divisors is an integer number (116073484).

Almost surely, 2^643161103 is an apocalyptic number.

643161103 is a deficient number, since it is larger than the sum of its proper divisors (53279801).

643161103 is a wasteful number, since it uses less digits than its factorization.

643161103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3805713 (or 3805700 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 643161103 is about 25360.6211083246. The cubic root of 643161103 is about 863.1903776689.

The spelling of 643161103 in words is "six hundred forty-three million, one hundred sixty-one thousand, one hundred three".