212664106309 has 2 divisors, whose sum is σ = 212664106310. Its totient is φ = 212664106308.

The previous prime is 212664106301. The next prime is 212664106373. The reversal of 212664106309 is 903601466212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158224950625 + 54439155684 = 397775^2 + 233322^2 .

It is a cyclic number.

It is not a de Polignac number, because 212664106309 - 2³ = 212664106301 is a prime.

It is a super-2 number, since 2×212664106309² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212664106301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106332053154 + 106332053155.

It is an arithmetic number, because the mean of its divisors is an integer number (106332053155).

Almost surely, 2^212664106309 is an apocalyptic number.

It is an amenable number.

212664106309 is a deficient number, since it is larger than the sum of its proper divisors (1).

212664106309 is an equidigital number, since it uses as much as digits as its factorization.

212664106309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 212664106309 in words is "two hundred twelve billion, six hundred sixty-four million, one hundred six thousand, three hundred nine".