208754868643 has 2 divisors, whose sum is σ = 208754868644. Its totient is φ = 208754868642.

The previous prime is 208754868583. The next prime is 208754868659. The reversal of 208754868643 is 346868457802.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 208754868643 - 2¹³ = 208754860451 is a prime.

It is a super-2 number, since 2×208754868643² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (208754808643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104377434321 + 104377434322.

It is an arithmetic number, because the mean of its divisors is an integer number (104377434322).

Almost surely, 2^208754868643 is an apocalyptic number.

208754868643 is a deficient number, since it is larger than the sum of its proper divisors (1).

208754868643 is an equidigital number, since it uses as much as digits as its factorization.

208754868643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61931520, while the sum is 61.

The spelling of 208754868643 in words is "two hundred eight billion, seven hundred fifty-four million, eight hundred sixty-eight thousand, six hundred forty-three".