209794838377 has 2 divisors, whose sum is σ = 209794838378. Its totient is φ = 209794838376.

The previous prime is 209794838333. The next prime is 209794838401. The reversal of 209794838377 is 773838497902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192910694656 + 16884143721 = 439216^2 + 129939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209794838377 is a prime.

It is not a weakly prime, because it can be changed into another prime (209704838377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104897419188 + 104897419189.

It is an arithmetic number, because the mean of its divisors is an integer number (104897419189).

Almost surely, 2^209794838377 is an apocalyptic number.

It is an amenable number.

209794838377 is a deficient number, since it is larger than the sum of its proper divisors (1).

209794838377 is an equidigital number, since it uses as much as digits as its factorization.

209794838377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128024064, while the sum is 67.

The spelling of 209794838377 in words is "two hundred nine billion, seven hundred ninety-four million, eight hundred thirty-eight thousand, three hundred seventy-seven".