209610628819 has 2 divisors, whose sum is σ = 209610628820. Its totient is φ = 209610628818.

The previous prime is 209610628817. The next prime is 209610628867. The reversal of 209610628819 is 918826016902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209610628819 - 2¹ = 209610628817 is a prime.

It is a super-2 number, since 2×209610628819² (a number of 23 digits) contains 22 as substring.

Together with 209610628817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (209610628817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104805314409 + 104805314410.

It is an arithmetic number, because the mean of its divisors is an integer number (104805314410).

Almost surely, 2^209610628819 is an apocalyptic number.

209610628819 is a deficient number, since it is larger than the sum of its proper divisors (1).

209610628819 is an equidigital number, since it uses as much as digits as its factorization.

209610628819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 209610628819 in words is "two hundred nine billion, six hundred ten million, six hundred twenty-eight thousand, eight hundred nineteen".