200166721361 has 2 divisors, whose sum is σ = 200166721362. Its totient is φ = 200166721360.

The previous prime is 200166721301. The next prime is 200166721439. The reversal of 200166721361 is 163127661002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196342041025 + 3824680336 = 443105^2 + 61844^2 .

It is a cyclic number.

It is not a de Polignac number, because 200166721361 - 2⁶ = 200166721297 is a prime.

It is not a weakly prime, because it can be changed into another prime (200166721301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100083360680 + 100083360681.

It is an arithmetic number, because the mean of its divisors is an integer number (100083360681).

Almost surely, 2^200166721361 is an apocalyptic number.

It is an amenable number.

200166721361 is a deficient number, since it is larger than the sum of its proper divisors (1).

200166721361 is an equidigital number, since it uses as much as digits as its factorization.

200166721361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 200166721361 in words is "two hundred billion, one hundred sixty-six million, seven hundred twenty-one thousand, three hundred sixty-one".