212626643609 has 2 divisors, whose sum is σ = 212626643610. Its totient is φ = 212626643608.

The previous prime is 212626643599. The next prime is 212626643623. The reversal of 212626643609 is 906346626212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201080496400 + 11546147209 = 448420^2 + 107453^2 .

It is a cyclic number.

It is not a de Polignac number, because 212626643609 - 2¹² = 212626639513 is a prime.

It is not a weakly prime, because it can be changed into another prime (212626643809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106313321804 + 106313321805.

It is an arithmetic number, because the mean of its divisors is an integer number (106313321805).

Almost surely, 2^212626643609 is an apocalyptic number.

It is an amenable number.

212626643609 is a deficient number, since it is larger than the sum of its proper divisors (1).

212626643609 is an equidigital number, since it uses as much as digits as its factorization.

212626643609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 47.

The spelling of 212626643609 in words is "two hundred twelve billion, six hundred twenty-six million, six hundred forty-three thousand, six hundred nine".