5205236643 has 12 divisors (see below), whose sum is σ = 7519540600. Its totient is φ = 3469758336.

The previous prime is 5205236587. The next prime is 5205236657. The reversal of 5205236643 is 3466325025.

5205236643 is a `hidden beast` number, since 5 + 2 + 0 + 5 + 2 + 3 + 6 + 643 = 666.

5205236643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5205236643 - 2²⁶ = 5138127779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5205236598 and 5205236607.

It is not an unprimeable number, because it can be changed into a prime (5205236683) 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, 64308 + ... + 120606.

Almost surely, 2^5205236643 is an apocalyptic number.

5205236643 is a deficient number, since it is larger than the sum of its proper divisors (2314303957).

5205236643 is a wasteful number, since it uses less digits than its factorization.

5205236643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66578 (or 66575 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The square root of 5205236643 is about 72147.3259587630. The cubic root of 5205236643 is about 1733.0595777436.

The spelling of 5205236643 in words is "five billion, two hundred five million, two hundred thirty-six thousand, six hundred forty-three".