643427992269 has 24 divisors (see below), whose sum is σ = 970693045920. Its totient is φ = 410284808928.

The previous prime is 643427992237. The next prime is 643427992271. The reversal of 643427992269 is 962299724346.

643427992269 is a `hidden beast` number, since 6 + 43 + 427 + 99 + 22 + 69 = 666.

It is not a de Polignac number, because 643427992269 - 2⁵ = 643427992237 is a prime.

It is a super-3 number, since 3×643427992269³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643427992279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16355067 + ... + 16394360.

It is an arithmetic number, because the mean of its divisors is an integer number (40445543580).

Almost surely, 2^643427992269 is an apocalyptic number.

It is an amenable number.

643427992269 is a deficient number, since it is larger than the sum of its proper divisors (327265053651).

643427992269 is a wasteful number, since it uses less digits than its factorization.

643427992269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32749529 (or 32749526 counting only the distinct ones).

The product of its digits is 70543872, while the sum is 63.

The spelling of 643427992269 in words is "six hundred forty-three billion, four hundred twenty-seven million, nine hundred ninety-two thousand, two hundred sixty-nine".