209486628511 has 2 divisors, whose sum is σ = 209486628512. Its totient is φ = 209486628510.

The previous prime is 209486628473. The next prime is 209486628517. The reversal of 209486628511 is 115826684902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209486628511 - 2²⁷ = 209352410783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209486628517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104743314255 + 104743314256.

It is an arithmetic number, because the mean of its divisors is an integer number (104743314256).

Almost surely, 2^209486628511 is an apocalyptic number.

209486628511 is a deficient number, since it is larger than the sum of its proper divisors (1).

209486628511 is an equidigital number, since it uses as much as digits as its factorization.

209486628511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 209486628511 in words is "two hundred nine billion, four hundred eighty-six million, six hundred twenty-eight thousand, five hundred eleven".