643103424261 has 8 divisors (see below), whose sum is σ = 952745813760. Its totient is φ = 428735616156.

The previous prime is 643103424209. The next prime is 643103424283. The reversal of 643103424261 is 162424301346.

643103424261 is a `hidden beast` number, since 6 + 43 + 10 + 342 + 4 + 261 = 666.

It is not a de Polignac number, because 643103424261 - 2⁷ = 643103424133 is a prime.

It is a super-2 number, since 2×643103424261² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643103424461) 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, 11909322645 + ... + 11909322698.

It is an arithmetic number, because the mean of its divisors is an integer number (119093226720).

Almost surely, 2^643103424261 is an apocalyptic number.

It is an amenable number.

643103424261 is a deficient number, since it is larger than the sum of its proper divisors (309642389499).

643103424261 is a wasteful number, since it uses less digits than its factorization.

643103424261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23818645352 (or 23818645346 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 643103424261 in words is "six hundred forty-three billion, one hundred three million, four hundred twenty-four thousand, two hundred sixty-one".