200187667721 has 2 divisors, whose sum is σ = 200187667722. Its totient is φ = 200187667720.

The previous prime is 200187667639. The next prime is 200187667723. The reversal of 200187667721 is 127766781002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168973612096 + 31214055625 = 411064^2 + 176675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200187667721 is a prime.

Together with 200187667723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (200187667723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100093833860 + 100093833861.

It is an arithmetic number, because the mean of its divisors is an integer number (100093833861).

Almost surely, 2^200187667721 is an apocalyptic number.

It is an amenable number.

200187667721 is a deficient number, since it is larger than the sum of its proper divisors (1).

200187667721 is an equidigital number, since it uses as much as digits as its factorization.

200187667721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 47.

The spelling of 200187667721 in words is "two hundred billion, one hundred eighty-seven million, six hundred sixty-seven thousand, seven hundred twenty-one".