206551623541 has 2 divisors, whose sum is σ = 206551623542. Its totient is φ = 206551623540.

The previous prime is 206551623511. The next prime is 206551623601. The reversal of 206551623541 is 145326155602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201556102500 + 4995521041 = 448950^2 + 70679^2 .

It is a cyclic number.

It is not a de Polignac number, because 206551623541 - 2⁷ = 206551623413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206551623494 and 206551623503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206551623511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103275811770 + 103275811771.

It is an arithmetic number, because the mean of its divisors is an integer number (103275811771).

Almost surely, 2^206551623541 is an apocalyptic number.

It is an amenable number.

206551623541 is a deficient number, since it is larger than the sum of its proper divisors (1).

206551623541 is an equidigital number, since it uses as much as digits as its factorization.

206551623541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 206551623541 in words is "two hundred six billion, five hundred fifty-one million, six hundred twenty-three thousand, five hundred forty-one".