209773443137 has 2 divisors, whose sum is σ = 209773443138. Its totient is φ = 209773443136.

The previous prime is 209773443101. The next prime is 209773443197. The reversal of 209773443137 is 731344377902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123657019201 + 86116423936 = 351649^2 + 293456^2 .

It is a cyclic number.

It is not a de Polignac number, because 209773443137 - 2⁶ = 209773443073 is a prime.

It is not a weakly prime, because it can be changed into another prime (209773443197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104886721568 + 104886721569.

It is an arithmetic number, because the mean of its divisors is an integer number (104886721569).

Almost surely, 2^209773443137 is an apocalyptic number.

It is an amenable number.

209773443137 is a deficient number, since it is larger than the sum of its proper divisors (1).

209773443137 is an equidigital number, since it uses as much as digits as its factorization.

209773443137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2667168, while the sum is 50.

The spelling of 209773443137 in words is "two hundred nine billion, seven hundred seventy-three million, four hundred forty-three thousand, one hundred thirty-seven".